atanh3
Inverse hyperbolic tangent functions
Usage
#include <math.h>
double
atanh(double x);
float
atanhf(float x);
long double
atanhl(long double x);
Library
Math Library (libm, -lm)
Overview
The atanh(), atanhf(), and atanhl() functions compute the inverse hyperbolic tangent of the real argument x. For a discussion of error due to roundoff, see math(3).
Return values
These functions return the inverse hyperbolic tangent of x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If |x| > 1, an invalid exception is raised and an is returned.
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 47 times.