Platform and version requirements: JVM (1.2), JS (1.2), Native (1.2)

fun atanh(x: Double): Double

fun atanh(x: Float): Float

Computes the inverse hyperbolic tangent of the value x.

The returned value is y such that tanh(y) == x.

Special cases:

• tanh(NaN) is NaN
• tanh(x) is NaN when x > 1 or x < -1
• tanh(1.0) is +Inf
• tanh(-1.0) is -Inf