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atanh, atanhf, atanhl - inverse hyperbolic
tangent function
#include <math.h>
double atanh(double x);
float atanhf(float x);
long double atanhl(long double x);
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.
- EDOM
- x is out of range.
SVID 3, POSIX, BSD 4.3,
ISO 9899. The float and long double variants are C99 requirements.
asinh(3)
,
acosh(3)
, cosh(3)
, sinh(3)
, tanh(3)
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