1.58 tanh, tanhf—hyperbolic tangent

Synopsis

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

Description

tanh computes the hyperbolic tangent of the argument x. Angles are specified in radians.

tanh(x) is defined as

      sinh(x)/cosh(x)

tanhf is identical, save that it takes and returns float values.