ATANH Section: Linux Programmer's Manual (3) Updated: June 13, 2025 Index   NAME atanh - inverse hyperbolic tangent function   SYNOPSIS #include <math.h> double atanh(double x);   DESCRIPTION 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, acosh() returns not-a-number (NaN) and errno is set.   ERRORS EDOM x is out of range.   CONFORMING TO SVID 3, POSIX, BSD 4.3, ISO 9899   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:58:02 GMT, March 24, 2025