Description
ATANH function calculates the inverse hyperbolic tangent of @x; that is the value whose hyperbolic tangent is @x. If the absolute value of @x is greater than 1.0, ATANH returns #NUM! error.
This function is Excel compatible.
Examples
ATANH(0.5) equals 0.549306.
ATANH(0.8) equals 1.098612.