ATANH (3)
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
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
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