atanh
Hurricane Electric Internet Services
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)
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