tanh() — Calculate Hyperbolic Tangent

Format

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

Language Level

ANSI

Threadsafe

Yes

Description

The tanh() function calculates the hyperbolic tangent of x, where x is expressed in radians.

Return Value

The tanh() function returns the value of the hyperbolic tangent of x. The result of tanh() cannot have a range error.

Example

This example computes x as the hyperbolic tangent of π⁄4. 
#include <math.h>
#include <stdio.h>
 
int main(void)
{
   double pi, x;
 
   pi = 3.1415926;
   x = tanh(pi/4);
 
   printf("tanh( %lf ) = %lf\n", pi/4, x);
}
 
/******************  Output should be similar to:  ****************
 
tanh( 0.785398 ) = 0.655794
*/

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