tanh() and tanhf()

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

tanh() computes the hyperbolic tangent of x.

tanh(x).

atan() and atanf(),

atan2() and atan2f(),

cosh() and coshf(),

sin() and sinf(), and

tan() and tanf()