CentOS 4.8

GNU/Linux	CentOS 4.8	i386
	tanh(3)

TANH

NAME

tanh, tanhf, tanhl − hyperbolic tangent function

#include <math.h>

double tanh(double x);

float tanhf(float x);

long double tanhl(long double x);

The tanh() function returns the hyperbolic tangent of x, which is defined mathematically as sinh(x) / cosh(x).

SVID 3, POSIX, BSD 4.3, ISO 9899 (C99). The float and the long double variants are C99 requirements.