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atanhl(3) -- Linux man page
NAME
atanh, atanhf, atanhl - inverse hyperbolic tangent function
SYNOPSIS
#include <math.h>
double atanh(double x);
float atanhf(float x);
long double atanhl(long 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.
The float and long double variants are C99 requirements.
SEE ALSO
asinh(3),
acosh(3),
cosh(3),
sinh(3),
tanh(3)
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