The ATANH function returns the hyperbolic arctangent of a number.
Syntax
              ATANH(
    <value>
)
Parameters
              - value: Number whose hyperbolic arctangent you want to calculate.
 
Returned value
              The ATANH function returns a real number.
Additional Information
              The argument must be a value between -1 and 1.

Category
              Mathematical and trigonometric