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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


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