Manuals/calci/ATANH

ATANH(Number)

Number is any value between -1 and 1.
- ATANH() returns the inverse hyperbolic tangent of a number.

Description

This function gives the Inverse Hyperbolic Tangent of a number.
Here 'z' is any number between -1 and 1. ie $-1<z<1$
Inverse Hyperbolic Tangent of a number is defined by $Atanh(z)={\frac {1}{2}}\log _{e}({\frac {1+z}{1-z}})$
TANH(-z)=-TANH(z). Also ATANH(TANH(z))=z
ATANH(1)=Infinty