ATANH
Section: Linux Programmer's Manual (3)
Updated: June 13, 1993
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
asinh(3), acosh(3), cosh(3), sinh(3), tanh(3)