ATANH

**Syntax:** **ATANH( X)**

*X* = a numeric value between -1 and 1

**ATANH** returns the hyperbolic arc tangent of angle *X*.
The result is the angle (in radians) whose hyperbolic
tangent is *X*.

**Examples:**

**ATANH**(0) = 0

**ATANH**(J20) = 1.127029, where J20 = 0.81

**ATANH**(1) = Error - **ATANH**, domain is -1 x 1

**Excel function:** ATANH

Grey Trout Software

02 March 2003