The 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 not-a-number (NaN).
De funksje ATANH( x) berekkent de ynverze hyperboalyske tangens y fan x; dit is de wearde wêrfan' t de hyperboalyske tangens x is. (x út (- 1, 1), y út R). As de absolute wearde fan x grutter is as 1. 0, dan jout ATANH () "not- a- number" (nan).