ATANH Returns the inverse hyperbolic tangent of a number. Number must be between -1 and 1 (excluding -1 and 1). The inverse hyperbolic tangent is the value whose hyperbolic tangent is number, so ATANH(TANH(number)) equals number.
Syntax
ATANH(number)
Parameters
Number – Any real number between 1 and -1.
Return Value
Returns the inverse hyperbolic tangent of a number.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference