tanh

The tanh function calculates the hyperbolic tangent for the floating-point value x.

The tanh function returns the hyperbolic tangent of x.

cosh, sinh

#include <math.h>
#include <stdio.h> /* for printf */

void tst_tanh (void) {
  float x;
  float y;
  float pi;

  pi = 3.14159;

  for (x = -(pi/4); x < (pi/4); x += 0.1) {
    y = tanh (x);
    printf ("TANH(%f) = %f\n", x, y);
  }
}