ATANH(3) BSD Library Functions Manual ATANH(3)
NAME
atanh, atanhf -- inverse hyperbolic tangent function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
atanh(double x);
float
atanhf(float x);
DESCRIPTION
The atanh() and atanhf() functions compute the inverse hyperbolic tangent of the real argument x.
RETURN VALUES
If |x|>=1, atanh(x) and atanhf(x) return +inf, -inf or NaN, and sets the global variable errno to EDOM.
SEE ALSO
acosh(3), asinh(3), exp(3), math(3)
HISTORY
The atanh() function appeared in 4.3BSD.
BSD
May 6, 1991 BSD
