diff --git a/.space.kts b/.space.kts
new file mode 100644
index 000000000..9dda0cbf7
--- /dev/null
+++ b/.space.kts
@@ -0,0 +1 @@
+job("Build") { gradlew("openjdk:11", "build") }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba3c5ad89..386e1277e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## [Unreleased]
 ### Added
-
+- Better trigonometric and hyperbolic functions for `AutoDiffField` (https://github.com/mipt-npm/kmath/pull/140).
 ### Changed
 
 ### Deprecated
@@ -10,7 +10,7 @@
 ### Removed
 
 ### Fixed
-
+- `symbol` method in `MstExtendedField` (https://github.com/mipt-npm/kmath/pull/140)
 ### Security
 ## [0.1.4]
 
diff --git a/build.gradle.kts b/build.gradle.kts
index aaef0059f..384db5385 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -5,7 +5,6 @@ plugins {
 }
 
 val kmathVersion by extra("0.1.4")
-
 val bintrayRepo by extra("scientifik")
 val githubProject by extra("kmath")
 
@@ -18,6 +17,14 @@ allprojects {
 
     group = "kscience.kmath"
     version = kmathVersion
+
+    afterEvaluate {
+        extensions.findByType<KotlinProjectExtension>()?.run {
+            sourceSets.all {
+                languageSettings.useExperimentalAnnotation("kotlin.contracts.ExperimentalContracts")
+            }
+        }
+    }
 }
 
 subprojects { if (name.startsWith("kmath")) apply(plugin = "ru.mipt.npm.publish") }
diff --git a/examples/src/main/kotlin/scientifik/kmath/structures/NDField.kt b/examples/src/main/kotlin/scientifik/kmath/structures/NDField.kt
index 1bc0ed7c8..54ffcb67c 100644
--- a/examples/src/main/kotlin/scientifik/kmath/structures/NDField.kt
+++ b/examples/src/main/kotlin/scientifik/kmath/structures/NDField.kt
@@ -3,7 +3,6 @@ package scientifik.kmath.structures
 import kotlinx.coroutines.GlobalScope
 import scientifik.kmath.operations.RealField
 import scientifik.kmath.operations.invoke
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
 import kotlin.system.measureTimeMillis
diff --git a/kmath-ast/build.gradle.kts b/kmath-ast/build.gradle.kts
index c376154b5..3e0a441b7 100644
--- a/kmath-ast/build.gradle.kts
+++ b/kmath-ast/build.gradle.kts
@@ -1,4 +1,6 @@
-plugins { id("ru.mipt.npm.mpp") }
+plugins {
+    id("ru.mipt.npm.mpp")
+}
 
 kotlin.sourceSets {
     commonMain {
diff --git a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MST.kt b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MST.kt
index 798172799..283a20649 100644
--- a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MST.kt
+++ b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MST.kt
@@ -6,6 +6,8 @@ import scientifik.kmath.operations.RealField
 
 /**
  * A Mathematical Syntax Tree node for mathematical expressions.
+ *
+ * @author Alexander Nozik
  */
 public sealed class MST {
     /**
@@ -48,6 +50,7 @@ public sealed class MST {
  * @receiver the algebra that provides operations.
  * @param node the node to evaluate.
  * @return the value of expression.
+ * @author Alexander Nozik
  */
 public fun <T> Algebra<T>.evaluate(node: MST): T = when (node) {
     is MST.Numeric -> (this as? NumericAlgebra<T>)?.number(node.value)
diff --git a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstAlgebra.kt b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstAlgebra.kt
index 7d13a2b25..8cee0ea0b 100644
--- a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstAlgebra.kt
+++ b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstAlgebra.kt
@@ -38,7 +38,8 @@ public object MstSpace : Space<MST>, NumericAlgebra<MST> {
  * [Ring] over [MST] nodes.
  */
 public object MstRing : Ring<MST>, NumericAlgebra<MST> {
-    override val zero: MST = number(0.0)
+    override val zero: MST
+        get() = MstSpace.zero
     override val one: MST = number(1.0)
 
     override fun number(value: Number): MST = MstSpace.number(value)
@@ -59,8 +60,11 @@ public object MstRing : Ring<MST>, NumericAlgebra<MST> {
  * [Field] over [MST] nodes.
  */
 public object MstField : Field<MST> {
-    public override val zero: MST = number(0.0)
-    public override val one: MST = number(1.0)
+    public override val zero: MST
+        get() = MstRing.zero
+
+    public override val one: MST
+        get() = MstRing.one
 
     public override fun symbol(value: String): MST = MstRing.symbol(value)
     public override fun number(value: Number): MST = MstRing.number(value)
@@ -79,14 +83,25 @@ public object MstField : Field<MST> {
  * [ExtendedField] over [MST] nodes.
  */
 public object MstExtendedField : ExtendedField<MST> {
-    override val zero: MST = number(0.0)
-    override val one: MST = number(1.0)
+    override val zero: MST
+        get() = MstField.zero
 
+    override val one: MST
+        get() = MstField.one
+
+    override fun symbol(value: String): MST = MstField.symbol(value)
     override fun sin(arg: MST): MST = unaryOperation(TrigonometricOperations.SIN_OPERATION, arg)
     override fun cos(arg: MST): MST = unaryOperation(TrigonometricOperations.COS_OPERATION, arg)
+    override fun tan(arg: MST): MST = unaryOperation(TrigonometricOperations.TAN_OPERATION, arg)
     override fun asin(arg: MST): MST = unaryOperation(TrigonometricOperations.ASIN_OPERATION, arg)
     override fun acos(arg: MST): MST = unaryOperation(TrigonometricOperations.ACOS_OPERATION, arg)
     override fun atan(arg: MST): MST = unaryOperation(TrigonometricOperations.ATAN_OPERATION, arg)
+    override fun sinh(arg: MST): MST = unaryOperation(HyperbolicOperations.SINH_OPERATION, arg)
+    override fun cosh(arg: MST): MST = unaryOperation(HyperbolicOperations.COSH_OPERATION, arg)
+    override fun tanh(arg: MST): MST = unaryOperation(HyperbolicOperations.TANH_OPERATION, arg)
+    override fun asinh(arg: MST): MST = unaryOperation(HyperbolicOperations.ASINH_OPERATION, arg)
+    override fun acosh(arg: MST): MST = unaryOperation(HyperbolicOperations.ACOSH_OPERATION, arg)
+    override fun atanh(arg: MST): MST = unaryOperation(HyperbolicOperations.ATANH_OPERATION, arg)
     override fun add(a: MST, b: MST): MST = MstField.add(a, b)
     override fun multiply(a: MST, k: Number): MST = MstField.multiply(a, k)
     override fun multiply(a: MST, b: MST): MST = MstField.multiply(a, b)
diff --git a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstExpression.kt b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstExpression.kt
index 9d8a6a804..d094e2fee 100644
--- a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstExpression.kt
+++ b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MstExpression.kt
@@ -11,6 +11,7 @@ import kotlin.contracts.contract
  *
  * @property algebra the algebra that provides operations.
  * @property mst the [MST] node.
+ * @author Alexander Nozik
  */
 public class MstExpression<T>(public val algebra: Algebra<T>, public val mst: MST) : Expression<T> {
     private inner class InnerAlgebra(val arguments: Map<String, T>) : NumericAlgebra<T> {
@@ -31,6 +32,8 @@ public class MstExpression<T>(public val algebra: Algebra<T>, public val mst: MS
 
 /**
  * Builds [MstExpression] over [Algebra].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any, A : Algebra<T>, E : Algebra<MST>> A.mst(
     mstAlgebra: E,
@@ -39,6 +42,8 @@ public inline fun <reified T : Any, A : Algebra<T>, E : Algebra<MST>> A.mst(
 
 /**
  * Builds [MstExpression] over [Space].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any> Space<T>.mstInSpace(block: MstSpace.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -47,6 +52,8 @@ public inline fun <reified T : Any> Space<T>.mstInSpace(block: MstSpace.() -> MS
 
 /**
  * Builds [MstExpression] over [Ring].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any> Ring<T>.mstInRing(block: MstRing.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -55,6 +62,8 @@ public inline fun <reified T : Any> Ring<T>.mstInRing(block: MstRing.() -> MST):
 
 /**
  * Builds [MstExpression] over [Field].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any> Field<T>.mstInField(block: MstField.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -63,6 +72,8 @@ public inline fun <reified T : Any> Field<T>.mstInField(block: MstField.() -> MS
 
 /**
  * Builds [MstExpression] over [ExtendedField].
+ *
+ * @author Iaroslav Postovalov
  */
 public inline fun <reified T : Any> Field<T>.mstInExtendedField(block: MstExtendedField.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -71,6 +82,8 @@ public inline fun <reified T : Any> Field<T>.mstInExtendedField(block: MstExtend
 
 /**
  * Builds [MstExpression] over [FunctionalExpressionSpace].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any, A : Space<T>> FunctionalExpressionSpace<T, A>.mstInSpace(block: MstSpace.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -79,6 +92,8 @@ public inline fun <reified T : Any, A : Space<T>> FunctionalExpressionSpace<T, A
 
 /**
  * Builds [MstExpression] over [FunctionalExpressionRing].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any, A : Ring<T>> FunctionalExpressionRing<T, A>.mstInRing(block: MstRing.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -87,6 +102,8 @@ public inline fun <reified T : Any, A : Ring<T>> FunctionalExpressionRing<T, A>.
 
 /**
  * Builds [MstExpression] over [FunctionalExpressionField].
+ *
+ * @author Alexander Nozik
  */
 public inline fun <reified T : Any, A : Field<T>> FunctionalExpressionField<T, A>.mstInField(block: MstField.() -> MST): MstExpression<T> {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -95,6 +112,8 @@ public inline fun <reified T : Any, A : Field<T>> FunctionalExpressionField<T, A
 
 /**
  * Builds [MstExpression] over [FunctionalExpressionExtendedField].
+ *
+ * @author Iaroslav Postovalov
  */
 public inline fun <reified T : Any, A : ExtendedField<T>> FunctionalExpressionExtendedField<T, A>.mstInExtendedField(
     block: MstExtendedField.() -> MST
diff --git a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/parser.kt b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/parser.kt
index 5733649e4..e48b2817f 100644
--- a/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/parser.kt
+++ b/kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/parser.kt
@@ -17,6 +17,8 @@ import scientifik.kmath.operations.SpaceOperations
 
 /**
  * TODO move to core
+ *
+ * @author Alexander Nozik and Iaroslav Postovalov
  */
 public object ArithmeticsEvaluator : Grammar<MST>() {
     // TODO replace with "...".toRegex() when better-parse 0.4.1 is released
@@ -85,6 +87,7 @@ public object ArithmeticsEvaluator : Grammar<MST>() {
  *
  * @receiver the string to parse.
  * @return the [MST] node.
+ * @author Alexander Nozik
  */
 public fun String.tryParseMath(): ParseResult<MST> = ArithmeticsEvaluator.tryParseToEnd(this)
 
@@ -93,5 +96,6 @@ public fun String.tryParseMath(): ParseResult<MST> = ArithmeticsEvaluator.tryPar
  *
  * @receiver the string to parse.
  * @return the [MST] node.
+ * @author Alexander Nozik
  */
 public fun String.parseMath(): MST = ArithmeticsEvaluator.parseToEnd(this)
diff --git a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/asm.kt b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/asm.kt
index 5d563aceb..3ca817b63 100644
--- a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/asm.kt
+++ b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/asm.kt
@@ -11,7 +11,12 @@ import scientifik.kmath.operations.Algebra
 import kotlin.reflect.KClass
 
 /**
- * Compile given MST to an Expression using AST compiler
+ * Compiles given MST to an Expression using AST compiler.
+ *
+ * @param type the target type.
+ * @param algebra the target algebra.
+ * @return the compiled expression.
+ * @author Alexander Nozik
  */
 public fun <T : Any> MST.compileWith(type: KClass<T>, algebra: Algebra<T>): Expression<T> {
     fun AsmBuilder<T>.visit(node: MST) {
@@ -54,11 +59,15 @@ public fun <T : Any> MST.compileWith(type: KClass<T>, algebra: Algebra<T>): Expr
 }
 
 /**
- * Compile an [MST] to ASM using given algebra
+ * Compiles an [MST] to ASM using given algebra.
+ *
+ * @author Alexander Nozik.
  */
 public inline fun <reified T : Any> Algebra<T>.expression(mst: MST): Expression<T> = mst.compileWith(T::class, this)
 
 /**
- * Optimize performance of an [MstExpression] using ASM codegen
+ * Optimizes performance of an [MstExpression] using ASM codegen.
+ *
+ * @author Alexander Nozik.
  */
 public inline fun <reified T : Any> MstExpression<T>.compile(): Expression<T> = mst.compileWith(T::class, algebra)
diff --git a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/AsmBuilder.kt b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/AsmBuilder.kt
index f8c159baf..1cf49a251 100644
--- a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/AsmBuilder.kt
+++ b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/AsmBuilder.kt
@@ -20,6 +20,7 @@ import kotlin.reflect.KClass
  * @property algebra the algebra the applied AsmExpressions use.
  * @property className the unique class name of new loaded class.
  * @property invokeLabel0Visitor the function to apply to this object when generating invoke method, label 0.
+ * @author Iaroslav Postovalov
  */
 internal class AsmBuilder<T> internal constructor(
     private val classOfT: KClass<*>,
diff --git a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/MstType.kt b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/MstType.kt
index bf73d304b..81e6791c1 100644
--- a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/MstType.kt
+++ b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/MstType.kt
@@ -2,6 +2,9 @@ package scientifik.kmath.asm.internal
 
 import scientifik.kmath.ast.MST
 
+/**
+ * Represents types known in [MST], numbers and general values.
+ */
 internal enum class MstType {
     GENERAL,
     NUMBER;
diff --git a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/codegenUtils.kt b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/codegenUtils.kt
index 6f51fe855..ab29d3614 100644
--- a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/codegenUtils.kt
+++ b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/codegenUtils.kt
@@ -6,28 +6,37 @@ import org.objectweb.asm.commons.InstructionAdapter
 import scientifik.kmath.ast.MST
 import scientifik.kmath.expressions.Expression
 import scientifik.kmath.operations.Algebra
+import scientifik.kmath.operations.FieldOperations
+import scientifik.kmath.operations.RingOperations
+import scientifik.kmath.operations.SpaceOperations
 import java.lang.reflect.Method
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
 import kotlin.reflect.KClass
 
 private val methodNameAdapters: Map<Pair<String, Int>, String> by lazy {
     hashMapOf(
-        "+" to 2 to "add",
-        "*" to 2 to "multiply",
-        "/" to 2 to "divide",
-        "+" to 1 to "unaryPlus",
-        "-" to 1 to "unaryMinus",
-        "-" to 2 to "minus"
+        SpaceOperations.PLUS_OPERATION to 2 to "add",
+        RingOperations.TIMES_OPERATION to 2 to "multiply",
+        FieldOperations.DIV_OPERATION to 2 to "divide",
+        SpaceOperations.PLUS_OPERATION to 1 to "unaryPlus",
+        SpaceOperations.MINUS_OPERATION to 1 to "unaryMinus",
+        SpaceOperations.MINUS_OPERATION to 2 to "minus"
     )
 }
 
+/**
+ * Returns ASM [Type] for given [KClass].
+ *
+ * @author Iaroslav Postovalov
+ */
 internal val KClass<*>.asm: Type
     get() = Type.getType(java)
 
 /**
  * Returns singleton array with this value if the [predicate] is true, returns empty array otherwise.
+ *
+ * @author Iaroslav Postovalov
  */
 internal inline fun <reified T> T.wrapToArrayIf(predicate: (T) -> Boolean): Array<T> {
     contract { callsInPlace(predicate, InvocationKind.EXACTLY_ONCE) }
@@ -36,11 +45,15 @@ internal inline fun <reified T> T.wrapToArrayIf(predicate: (T) -> Boolean): Arra
 
 /**
  * Creates an [InstructionAdapter] from this [MethodVisitor].
+ *
+ * @author Iaroslav Postovalov
  */
 private fun MethodVisitor.instructionAdapter(): InstructionAdapter = InstructionAdapter(this)
 
 /**
  * Creates an [InstructionAdapter] from this [MethodVisitor] and applies [block] to it.
+ *
+ * @author Iaroslav Postovalov
  */
 internal inline fun MethodVisitor.instructionAdapter(block: InstructionAdapter.() -> Unit): InstructionAdapter {
     contract { callsInPlace(block, InvocationKind.EXACTLY_ONCE) }
@@ -49,6 +62,8 @@ internal inline fun MethodVisitor.instructionAdapter(block: InstructionAdapter.(
 
 /**
  * Constructs a [Label], then applies it to this visitor.
+ *
+ * @author Iaroslav Postovalov
  */
 internal fun MethodVisitor.label(): Label = Label().also { visitLabel(it) }
 
@@ -57,6 +72,8 @@ internal fun MethodVisitor.label(): Label = Label().also { visitLabel(it) }
  *
  * This methods helps to avoid collisions of class name to prevent loading several classes with the same name. If there
  * is a colliding class, change [collision] parameter or leave it `0` to check existing classes recursively.
+ *
+ * @author Iaroslav Postovalov
  */
 internal tailrec fun buildName(mst: MST, collision: Int = 0): String {
     val name = "scientifik.kmath.asm.generated.AsmCompiledExpression_${mst.hashCode()}_$collision"
@@ -76,6 +93,11 @@ internal inline fun ClassWriter(flags: Int, block: ClassWriter.() -> Unit): Clas
     return ClassWriter(flags).apply(block)
 }
 
+/**
+ * Invokes [visitField] and applies [block] to the [FieldVisitor].
+ *
+ * @author Iaroslav Postovalov
+ */
 internal inline fun ClassWriter.visitField(
     access: Int,
     name: String,
@@ -105,7 +127,7 @@ private fun <T> AsmBuilder<T>.findSpecific(context: Algebra<T>, name: String, pa
  * Checks if the target [context] for code generation contains a method with needed [name] and arity, also builds
  * type expectation stack for needed arity.
  *
- * @return `true` if contains, else `false`.
+ * @author Iaroslav Postovalov
  */
 private fun <T> AsmBuilder<T>.buildExpectationStack(
     context: Algebra<T>,
@@ -137,7 +159,7 @@ private fun <T> AsmBuilder<T>.mapTypes(method: Method, parameterTypes: Array<Mst
  * Checks if the target [context] for code generation contains a method with needed [name] and arity and inserts
  * [AsmBuilder.invokeAlgebraOperation] of this method.
  *
- * @return `true` if contains, else `false`.
+ * @author Iaroslav Postovalov
  */
 private fun <T> AsmBuilder<T>.tryInvokeSpecific(
     context: Algebra<T>,
@@ -161,7 +183,9 @@ private fun <T> AsmBuilder<T>.tryInvokeSpecific(
 }
 
 /**
- * Builds specialized algebra call with option to fallback to generic algebra operation accepting String.
+ * Builds specialized [context] call with option to fallback to generic algebra operation accepting [String].
+ *
+ * @author Iaroslav Postovalov
  */
 internal inline fun <T> AsmBuilder<T>.buildAlgebraOperationCall(
     context: Algebra<T>,
diff --git a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/mapIntrinsics.kt b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/mapIntrinsics.kt
index 80e83c1bf..997dbbfe5 100644
--- a/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/mapIntrinsics.kt
+++ b/kmath-ast/src/jvmMain/kotlin/scientifik/kmath/asm/internal/mapIntrinsics.kt
@@ -2,6 +2,11 @@
 
 package scientifik.kmath.asm.internal
 
+/**
+ * Gets value with given [key] or throws [IllegalStateException] whenever it is not present.
+ *
+ * @author Iaroslav Postovalov
+ */
 @JvmOverloads
 internal fun <K, V> Map<K, V>.getOrFail(key: K, default: V? = null): V =
     this[key] ?: default ?: error("Parameter not found: $key")
diff --git a/kmath-commons/build.gradle.kts b/kmath-commons/build.gradle.kts
index b64b855a4..ed6452ad8 100644
--- a/kmath-commons/build.gradle.kts
+++ b/kmath-commons/build.gradle.kts
@@ -1,4 +1,6 @@
-plugins { id("ru.mipt.npm.jvm") }
+plugins {
+    id("ru.mipt.npm.jvm")
+}
 description = "Commons math binding for kmath"
 
 dependencies {
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/expressions/expressionBuilders.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/expressions/expressionBuilders.kt
index 737f94b38..3af24b595 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/expressions/expressionBuilders.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/expressions/expressionBuilders.kt
@@ -4,7 +4,6 @@ import scientifik.kmath.operations.ExtendedField
 import scientifik.kmath.operations.Field
 import scientifik.kmath.operations.Ring
 import scientifik.kmath.operations.Space
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
 
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/FeaturedMatrix.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/FeaturedMatrix.kt
index 2cd507078..d5f8f8e20 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/FeaturedMatrix.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/linear/FeaturedMatrix.kt
@@ -4,7 +4,6 @@ import scientifik.kmath.operations.Ring
 import scientifik.kmath.structures.Matrix
 import scientifik.kmath.structures.Structure2D
 import scientifik.kmath.structures.asBuffer
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 import kotlin.math.sqrt
 
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/misc/AutoDiff.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/misc/AutoDiff.kt
index 6bed19456..1c4cc63b6 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/misc/AutoDiff.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/misc/AutoDiff.kt
@@ -6,7 +6,6 @@ import scientifik.kmath.operations.Field
 import scientifik.kmath.operations.invoke
 import scientifik.kmath.operations.sum
 import scientifik.kmath.structures.asBuffer
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
 
@@ -209,3 +208,40 @@ public fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.sin(x: Variable<T
 // cos(x)
 public fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.cos(x: Variable<T>): Variable<T> =
     derive(variable { cos(x.value) }) { z -> x.d -= z.d * sin(x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.tan(x: Variable<T>): Variable<T> =
+    derive(variable { tan(x.value) }) { z ->
+        val c = cos(x.value)
+        x.d += z.d / (c * c)
+    }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.asin(x: Variable<T>): Variable<T> =
+    derive(variable { asin(x.value) }) { z -> x.d += z.d / sqrt(one - x.value * x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.acos(x: Variable<T>): Variable<T> =
+    derive(variable { acos(x.value) }) { z -> x.d -= z.d / sqrt(one - x.value * x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.atan(x: Variable<T>): Variable<T> =
+    derive(variable { atan(x.value) }) { z -> x.d += z.d / (one + x.value * x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.sinh(x: Variable<T>): Variable<T> =
+    derive(variable { sin(x.value) }) { z -> x.d += z.d * cosh(x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.cosh(x: Variable<T>): Variable<T> =
+    derive(variable { cos(x.value) }) { z -> x.d += z.d * sinh(x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.tanh(x: Variable<T>): Variable<T> =
+    derive(variable { tan(x.value) }) { z ->
+        val c = cosh(x.value)
+        x.d += z.d / (c * c)
+    }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.asinh(x: Variable<T>): Variable<T> =
+    derive(variable { asinh(x.value) }) { z -> x.d += z.d / sqrt(one + x.value * x.value) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.acosh(x: Variable<T>): Variable<T> =
+    derive(variable { acosh(x.value) }) { z -> x.d += z.d / (sqrt((x.value - one) * (x.value + one))) }
+
+fun <T : Any, F : ExtendedField<T>> AutoDiffField<T, F>.atanh(x: Variable<T>): Variable<T> =
+    derive(variable { atanh(x.value) }) { z -> x.d += z.d / (one - x.value * x.value) }
+
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/AlgebraExtensions.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/AlgebraExtensions.kt
index b80e7582d..1020df7d9 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/AlgebraExtensions.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/AlgebraExtensions.kt
@@ -24,6 +24,7 @@ public fun <T> Space<T>.sum(data: Sequence<T>): T = data.fold(zero) { left, righ
  * @receiver the algebra that provides addition and division.
  * @param data the iterable to find average.
  * @return the average value.
+ * @author Iaroslav Postovalov
  */
 public fun <T> Space<T>.average(data: Iterable<T>): T = sum(data) / data.count()
 
@@ -33,6 +34,7 @@ public fun <T> Space<T>.average(data: Iterable<T>): T = sum(data) / data.count()
  * @receiver the algebra that provides addition and division.
  * @param data the sequence to find average.
  * @return the average value.
+ * @author Iaroslav Postovalov
  */
 public fun <T> Space<T>.average(data: Sequence<T>): T = sum(data) / data.count()
 
@@ -60,6 +62,7 @@ public fun <T> Sequence<T>.sumWith(space: Space<T>): T = space.sum(this)
  * @receiver the iterable to find average.
  * @param space the algebra that provides addition and division.
  * @return the average value.
+ * @author Iaroslav Postovalov
  */
 public fun <T> Iterable<T>.averageWith(space: Space<T>): T = space.average(this)
 
@@ -69,6 +72,7 @@ public fun <T> Iterable<T>.averageWith(space: Space<T>): T = space.average(this)
  * @receiver the sequence to find average.
  * @param space the algebra that provides addition and division.
  * @return the average value.
+ * @author Iaroslav Postovalov
  */
 public fun <T> Sequence<T>.averageWith(space: Space<T>): T = space.average(this)
 
@@ -98,6 +102,7 @@ public fun <T> Ring<T>.power(arg: T, power: Int): T {
  * @param arg the base.
  * @param power the exponent.
  * @return the base raised to the power.
+ * @author Iaroslav Postovalov
  */
 public fun <T> Field<T>.power(arg: T, power: Int): T {
     require(power != 0 || arg != zero) { "The $zero raised to $power is not defined." }
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/Complex.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/Complex.kt
index 20decf0e0..05a592e97 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/Complex.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/Complex.kt
@@ -6,6 +6,7 @@ import scientifik.kmath.structures.MutableBuffer
 import scientifik.memory.MemoryReader
 import scientifik.memory.MemorySpec
 import scientifik.memory.MemoryWriter
+import kotlin.contracts.contract
 import kotlin.math.*
 
 /**
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/Buffers.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/Buffers.kt
index d44100037..4326159d3 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/Buffers.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/Buffers.kt
@@ -2,6 +2,7 @@ package scientifik.kmath.structures
 
 import scientifik.kmath.operations.Complex
 import scientifik.kmath.operations.complex
+import kotlin.contracts.contract
 import kotlin.reflect.KClass
 
 /**
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FlaggedBuffer.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FlaggedBuffer.kt
index d1165b895..f627ede07 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FlaggedBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FlaggedBuffer.kt
@@ -1,5 +1,6 @@
 package scientifik.kmath.structures
 
+import kotlin.contracts.contract
 import kotlin.experimental.and
 
 /**
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FloatBuffer.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FloatBuffer.kt
index 48947b8d7..4bf7d6ad2 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FloatBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/FloatBuffer.kt
@@ -1,12 +1,12 @@
 package scientifik.kmath.structures
 
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 
 /**
  * Specialized [MutableBuffer] implementation over [FloatArray].
  *
  * @property array the underlying array.
+ * @author Iaroslav Postovalov
  */
 public inline class FloatBuffer(public val array: FloatArray) : MutableBuffer<Float> {
     override val size: Int get() = array.size
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/IntBuffer.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/IntBuffer.kt
index 49cc06755..7daa48201 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/IntBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/IntBuffer.kt
@@ -1,5 +1,7 @@
 package scientifik.kmath.structures
 
+import kotlin.contracts.contract
+
 /**
  * Specialized [MutableBuffer] implementation over [IntArray].
  *
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/LongBuffer.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/LongBuffer.kt
index f6c3421cd..f87fdc705 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/LongBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/LongBuffer.kt
@@ -1,6 +1,5 @@
 package scientifik.kmath.structures
 
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 
 /**
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/RealBuffer.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/RealBuffer.kt
index 050e5eddb..dbb599c85 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/RealBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/RealBuffer.kt
@@ -1,5 +1,7 @@
 package scientifik.kmath.structures
 
+import kotlin.contracts.contract
+
 /**
  * Specialized [MutableBuffer] implementation over [DoubleArray].
  *
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/ShortBuffer.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/ShortBuffer.kt
index de26da460..b364630f7 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/ShortBuffer.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/structures/ShortBuffer.kt
@@ -1,5 +1,7 @@
 package scientifik.kmath.structures
 
+import kotlin.contracts.contract
+
 /**
  * Specialized [MutableBuffer] implementation over [ShortArray].
  *
diff --git a/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt b/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt
index 34bd8a0e3..9de9fb575 100644
--- a/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt
+++ b/kmath-core/src/commonTest/kotlin/scientifik/kmath/linear/RealLUSolverTest.kt
@@ -1,11 +1,9 @@
 package scientifik.kmath.linear
 
 import scientifik.kmath.structures.Matrix
-import kotlin.contracts.ExperimentalContracts
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
-@ExperimentalContracts
 class RealLUSolverTest {
 
     @Test
diff --git a/kmath-core/src/commonTest/kotlin/scientifik/kmath/misc/AutoDiffTest.kt b/kmath-core/src/commonTest/kotlin/scientifik/kmath/misc/AutoDiffTest.kt
index c08a63ccb..91d32cf8e 100644
--- a/kmath-core/src/commonTest/kotlin/scientifik/kmath/misc/AutoDiffTest.kt
+++ b/kmath-core/src/commonTest/kotlin/scientifik/kmath/misc/AutoDiffTest.kt
@@ -3,19 +3,19 @@ package scientifik.kmath.misc
 import scientifik.kmath.operations.RealField
 import scientifik.kmath.structures.asBuffer
 import kotlin.math.PI
+import kotlin.math.pow
+import kotlin.math.sqrt
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
 class AutoDiffTest {
-    fun Variable(int: Int): Variable<Double> = Variable(int.toDouble())
-
-    fun deriv(body: AutoDiffField<Double, RealField>.() -> Variable<Double>): DerivationResult<Double> =
+    inline fun deriv(body: AutoDiffField<Double, RealField>.() -> Variable<Double>): DerivationResult<Double> =
         RealField.deriv(body)
 
     @Test
     fun testPlusX2() {
-        val x = Variable(3) // diff w.r.t this x at 3
+        val x = Variable(3.0) // diff w.r.t this x at 3
         val y = deriv { x + x }
         assertEquals(6.0, y.value) //    y  = x + x = 6
         assertEquals(2.0, y.deriv(x)) // dy/dx = 2
@@ -24,8 +24,8 @@ class AutoDiffTest {
     @Test
     fun testPlus() {
         // two variables
-        val x = Variable(2)
-        val y = Variable(3)
+        val x = Variable(2.0)
+        val y = Variable(3.0)
         val z = deriv { x + y }
         assertEquals(5.0, z.value) //    z  = x + y = 5
         assertEquals(1.0, z.deriv(x)) // dz/dx = 1
@@ -35,8 +35,8 @@ class AutoDiffTest {
     @Test
     fun testMinus() {
         // two variables
-        val x = Variable(7)
-        val y = Variable(3)
+        val x = Variable(7.0)
+        val y = Variable(3.0)
         val z = deriv { x - y }
         assertEquals(4.0, z.value)  //    z  = x - y = 4
         assertEquals(1.0, z.deriv(x))  // dz/dx = 1
@@ -45,7 +45,7 @@ class AutoDiffTest {
 
     @Test
     fun testMulX2() {
-        val x = Variable(3) // diff w.r.t this x at 3
+        val x = Variable(3.0) // diff w.r.t this x at 3
         val y = deriv { x * x }
         assertEquals(9.0, y.value) //    y  = x * x = 9
         assertEquals(6.0, y.deriv(x)) // dy/dx = 2 * x = 7
@@ -53,7 +53,7 @@ class AutoDiffTest {
 
     @Test
     fun testSqr() {
-        val x = Variable(3)
+        val x = Variable(3.0)
         val y = deriv { sqr(x) }
         assertEquals(9.0, y.value) //    y  = x ^ 2 = 9
         assertEquals(6.0, y.deriv(x)) // dy/dx = 2 * x = 7
@@ -61,7 +61,7 @@ class AutoDiffTest {
 
     @Test
     fun testSqrSqr() {
-        val x = Variable(2)
+        val x = Variable(2.0)
         val y = deriv { sqr(sqr(x)) }
         assertEquals(16.0, y.value) //     y = x ^ 4   = 16
         assertEquals(32.0, y.deriv(x)) // dy/dx = 4 * x^3 = 32
@@ -69,7 +69,7 @@ class AutoDiffTest {
 
     @Test
     fun testX3() {
-        val x = Variable(2) // diff w.r.t this x at 2
+        val x = Variable(2.0) // diff w.r.t this x at 2
         val y = deriv { x * x * x }
         assertEquals(8.0, y.value)  //    y  = x * x * x = 8
         assertEquals(12.0, y.deriv(x)) // dy/dx = 3 * x * x = 12
@@ -77,8 +77,8 @@ class AutoDiffTest {
 
     @Test
     fun testDiv() {
-        val x = Variable(5)
-        val y = Variable(2)
+        val x = Variable(5.0)
+        val y = Variable(2.0)
         val z = deriv { x / y }
         assertEquals(2.5, z.value)   //     z =  x / y   = 2.5
         assertEquals(0.5, z.deriv(x))   // dz/dx =  1 / y   = 0.5
@@ -87,7 +87,7 @@ class AutoDiffTest {
 
     @Test
     fun testPow3() {
-        val x = Variable(2) // diff w.r.t this x at 2
+        val x = Variable(2.0) // diff w.r.t this x at 2
         val y = deriv { pow(x, 3) }
         assertEquals(8.0, y.value)  //    y  = x ^ 3     = 8
         assertEquals(12.0, y.deriv(x)) // dy/dx = 3 * x ^ 2 = 12
@@ -95,8 +95,8 @@ class AutoDiffTest {
 
     @Test
     fun testPowFull() {
-        val x = Variable(2)
-        val y = Variable(3)
+        val x = Variable(2.0)
+        val y = Variable(3.0)
         val z = deriv { pow(x, y) }
         assertApprox(8.0, z.value)           //     z = x ^ y = 8
         assertApprox(12.0, z.deriv(x))          // dz/dx = y * x ^ (y - 1) = 12
@@ -105,7 +105,7 @@ class AutoDiffTest {
 
     @Test
     fun testFromPaper() {
-        val x = Variable(3)
+        val x = Variable(3.0)
         val y = deriv { 2 * x + x * x * x }
         assertEquals(33.0, y.value)  //     y = 2 * x + x * x * x = 33
         assertEquals(29.0, y.deriv(x))  // dy/dx = 2 + 3 * x * x = 29
@@ -113,9 +113,9 @@ class AutoDiffTest {
 
     @Test
     fun testInnerVariable() {
-        val x = Variable(1)
+        val x = Variable(1.0)
         val y = deriv {
-            Variable(1) * x
+            Variable(1.0) * x
         }
         assertEquals(1.0, y.value)          //     y = x ^ n = 1
         assertEquals(1.0, y.deriv(x)) // dy/dx = n * x ^ (n - 1) = n - 1
@@ -124,9 +124,9 @@ class AutoDiffTest {
     @Test
     fun testLongChain() {
         val n = 10_000
-        val x = Variable(1)
+        val x = Variable(1.0)
         val y = deriv {
-            var res = Variable(1)
+            var res = Variable(1.0)
             for (i in 1..n) res *= x
             res
         }
@@ -136,7 +136,7 @@ class AutoDiffTest {
 
     @Test
     fun testExample() {
-        val x = Variable(2)
+        val x = Variable(2.0)
         val y = deriv { sqr(x) + 5 * x + 3 }
         assertEquals(17.0, y.value) // the value of result (y)
         assertEquals(9.0, y.deriv(x))  // dy/dx
@@ -144,7 +144,7 @@ class AutoDiffTest {
 
     @Test
     fun testSqrt() {
-        val x = Variable(16)
+        val x = Variable(16.0)
         val y = deriv { sqrt(x) }
         assertEquals(4.0, y.value)     //     y = x ^ 1/2 = 4
         assertEquals(1.0 / 8, y.deriv(x)) // dy/dx = 1/2 / x ^ 1/4 = 1/8
@@ -152,18 +152,98 @@ class AutoDiffTest {
 
     @Test
     fun testSin() {
-        val x = Variable(PI / 6)
+        val x = Variable(PI / 6.0)
         val y = deriv { sin(x) }
-        assertApprox(0.5, y.value)           //    y = sin(PI/6) = 0.5
-        assertApprox(kotlin.math.sqrt(3.0) / 2, y.deriv(x)) // dy/dx = cos(PI/6) = sqrt(3)/2
+        assertApprox(0.5, y.value) // y = sin(PI/6) = 0.5
+        assertApprox(sqrt(3.0) / 2, y.deriv(x)) // dy/dx = cos(pi/6) = sqrt(3)/2
     }
 
     @Test
     fun testCos() {
         val x = Variable(PI / 6)
         val y = deriv { cos(x) }
-        assertApprox(kotlin.math.sqrt(3.0) / 2, y.value) //     y =  cos(PI/6) = sqrt(3)/2
-        assertApprox(-0.5, y.deriv(x))          // dy/dx = -sin(PI/6) = -0.5
+        assertApprox(sqrt(3.0) / 2, y.value) //y = cos(pi/6) = sqrt(3)/2
+        assertApprox(-0.5, y.deriv(x)) // dy/dx = -sin(pi/6) = -0.5
+    }
+
+    @Test
+    fun testTan() {
+        val x = Variable(PI / 6)
+        val y = deriv { tan(x) }
+        assertApprox(1.0 / sqrt(3.0), y.value) // y = tan(pi/6) = 1/sqrt(3)
+        assertApprox(4.0 / 3.0, y.deriv(x)) // dy/dx = sec(pi/6)^2 = 4/3
+    }
+
+    @Test
+    fun testAsin() {
+        val x = Variable(PI / 6)
+        val y = deriv { asin(x) }
+        assertApprox(kotlin.math.asin(PI / 6.0), y.value) // y = asin(pi/6)
+        assertApprox(6.0 / sqrt(36 - PI * PI), y.deriv(x)) // dy/dx = 6/sqrt(36-pi^2)
+    }
+
+    @Test
+    fun testAcos() {
+        val x = Variable(PI / 6)
+        val y = deriv { acos(x) }
+        assertApprox(kotlin.math.acos(PI / 6.0), y.value) // y = acos(pi/6)
+        assertApprox(-6.0 / sqrt(36.0 - PI * PI), y.deriv(x)) // dy/dx = -6/sqrt(36-pi^2)
+    }
+
+    @Test
+    fun testAtan() {
+        val x = Variable(PI / 6)
+        val y = deriv { atan(x) }
+        assertApprox(kotlin.math.atan(PI / 6.0), y.value) // y = atan(pi/6)
+        assertApprox(36.0 / (36.0 + PI * PI), y.deriv(x)) // dy/dx = 36/(36+pi^2)
+    }
+
+    @Test
+    fun testSinh() {
+        val x = Variable(0.0)
+        val y = deriv { sinh(x) }
+        assertApprox(kotlin.math.sinh(0.0), y.value) // y = sinh(0)
+        assertApprox(kotlin.math.cosh(0.0), y.deriv(x)) // dy/dx = cosh(0)
+    }
+
+    @Test
+    fun testCosh() {
+        val x = Variable(0.0)
+        val y = deriv { cosh(x) }
+        assertApprox(1.0, y.value) //y = cosh(0)
+        assertApprox(0.0, y.deriv(x)) // dy/dx = sinh(0)
+    }
+
+    @Test
+    fun testTanh() {
+        val x = Variable(PI / 6)
+        val y = deriv { tanh(x) }
+        assertApprox(1.0 / sqrt(3.0), y.value) // y = tanh(pi/6)
+        assertApprox(1.0 / kotlin.math.cosh(PI / 6.0).pow(2), y.deriv(x)) // dy/dx = sech(pi/6)^2
+    }
+
+    @Test
+    fun testAsinh() {
+        val x = Variable(PI / 6)
+        val y = deriv { asinh(x) }
+        assertApprox(kotlin.math.asinh(PI / 6.0), y.value) // y = asinh(pi/6)
+        assertApprox(6.0 / sqrt(36 + PI * PI), y.deriv(x)) // dy/dx = 6/sqrt(pi^2+36)
+    }
+
+    @Test
+    fun testAcosh() {
+        val x = Variable(PI / 6)
+        val y = deriv { acosh(x) }
+        assertApprox(kotlin.math.acosh(PI / 6.0), y.value) // y = acosh(pi/6)
+        assertApprox(-6.0 / sqrt(36.0 - PI * PI), y.deriv(x)) // dy/dx = -6/sqrt(36-pi^2)
+    }
+
+    @Test
+    fun testAtanh() {
+        val x = Variable(PI / 6.0)
+        val y = deriv { atanh(x) }
+        assertApprox(kotlin.math.atanh(PI / 6.0), y.value) // y = atanh(pi/6)
+        assertApprox(-36.0 / (PI * PI - 36.0), y.deriv(x)) // dy/dx = -36/(pi^2-36)
     }
 
     @Test
diff --git a/kmath-for-real/build.gradle.kts b/kmath-for-real/build.gradle.kts
index 00abcb934..2a4539c10 100644
--- a/kmath-for-real/build.gradle.kts
+++ b/kmath-for-real/build.gradle.kts
@@ -1,4 +1,6 @@
-plugins { id("ru.mipt.npm.mpp") }
+plugins {
+    id("ru.mipt.npm.mpp")
+}
 
 kotlin.sourceSets.commonMain {
     dependencies {
diff --git a/kmath-for-real/src/commonMain/kotlin/scientifik/kmath/real/realMatrix.kt b/kmath-for-real/src/commonMain/kotlin/scientifik/kmath/real/realMatrix.kt
index f406c0aad..1bc5f0a5b 100644
--- a/kmath-for-real/src/commonMain/kotlin/scientifik/kmath/real/realMatrix.kt
+++ b/kmath-for-real/src/commonMain/kotlin/scientifik/kmath/real/realMatrix.kt
@@ -9,7 +9,6 @@ import scientifik.kmath.structures.Buffer
 import scientifik.kmath.structures.Matrix
 import scientifik.kmath.structures.RealBuffer
 import scientifik.kmath.structures.asIterable
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 import kotlin.math.pow
 
diff --git a/kmath-functions/build.gradle.kts b/kmath-functions/build.gradle.kts
index 00abcb934..2a4539c10 100644
--- a/kmath-functions/build.gradle.kts
+++ b/kmath-functions/build.gradle.kts
@@ -1,4 +1,6 @@
-plugins { id("ru.mipt.npm.mpp") }
+plugins {
+    id("ru.mipt.npm.mpp")
+}
 
 kotlin.sourceSets.commonMain {
     dependencies {
diff --git a/kmath-histograms/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt b/kmath-histograms/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt
index 530dee4f2..4ecd62809 100644
--- a/kmath-histograms/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt
+++ b/kmath-histograms/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt
@@ -4,9 +4,6 @@ import scientifik.kmath.domains.Domain
 import scientifik.kmath.linear.Point
 import scientifik.kmath.structures.ArrayBuffer
 import scientifik.kmath.structures.RealBuffer
-import kotlin.contracts.ExperimentalContracts
-import kotlin.contracts.InvocationKind
-import kotlin.contracts.contract
 
 /**
  * The bin in the histogram. The histogram is by definition always done in the real space
diff --git a/kmath-memory/src/jvmMain/kotlin/scientifik/memory/ByteBufferMemory.kt b/kmath-memory/src/jvmMain/kotlin/scientifik/memory/ByteBufferMemory.kt
index e98340a44..0e7c49c74 100644
--- a/kmath-memory/src/jvmMain/kotlin/scientifik/memory/ByteBufferMemory.kt
+++ b/kmath-memory/src/jvmMain/kotlin/scientifik/memory/ByteBufferMemory.kt
@@ -6,7 +6,6 @@ import java.nio.channels.FileChannel
 import java.nio.file.Files
 import java.nio.file.Path
 import java.nio.file.StandardOpenOption
-import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
 
diff --git a/kmath-prob/build.gradle.kts b/kmath-prob/build.gradle.kts
index 795a8760e..4c9663e5f 100644
--- a/kmath-prob/build.gradle.kts
+++ b/kmath-prob/build.gradle.kts
@@ -13,8 +13,4 @@ kotlin.sourceSets {
             api("org.apache.commons:commons-rng-simple:1.3")
         }
     }
-
-    jvmTest {
-        languageSettings.useExperimentalAnnotation("kotlinx.coroutines.FlowPreview")
-    }
 }