### tanh -- Calculate Hyperbolic Tangent

Format

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

Language Level: ANSI, POSIX, XPG4
tanh calculates the hyperbolic tangent of x, where x is expressed in radians.

Return Value
tanh 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 pi/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);
       return 0;

       /****************************************
          The output should be:

          tanh( 0.785398 ) = 0.655794
       ****************************************/
    }

acos -- Calculate Arccosine
asin -- Calculate Arcsine
atan - atan2 -- Calculate Arctangent
cos -- Calculate Cosine
cosh -- Calculate Hyperbolic Cosine
_fpatan -- Calculate Arctangent
_fptan -- Calculate Tangent
sin -- Calculate Sine
sinh -- Calculate Hyperbolic Sine
tan -- Calculate Tangent
<math.h>