C in a Nutshell

Name

tanh

Synopsis

Calculates the hyperbolic tangent of a number

#include <math.h>
doubletanh( double x);
float tanhf( float x);        (C99)
long double tanhl( long double x);        (C99)

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

Example

double x = -0.5, y1, y2;

y1 =tanh(x);
y2 = exp(2*x);
y2 = (y2 -1) / (y2 + 1);

printf("The tanh() function returns     %.15f.\n", y1 );
printf("Using the function exp() yields %.15f.\n", y2 );

This code produces the following output:

The tanh() function returns     -0.462117157260010.
Using the function exp() yields -0.462117157260010.

See Also

sinh(), cosh(), atanh(); the hyperbolic tangent and inverse tangent functions for complex numbers, ctanh() and catanh()