tanh

Syntax

#include <math.h> double tanh(double x);

Description

This function computes the hyperbolic tangent of x.

Return Value

The hyperbolic tangent of x. If x is either a positive or a negative infinity, the result is unity with the same sign as x, and errno is not changed. If x is NaN, the return value is NaN and errno is set to EDOM.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001