cosh, coshf---hyperbolic cosine

#include <math.h>
double cosh(double x);
float coshf(float x)

cosh computes the hyperbolic cosine of the argument x. cosh(x) is defined as

Angles are specified in radians. coshf is identical, save that it takes and returns float.

Returns
The computed value is returned. When the correct value would create an overflow, cosh returns the value HUGE_VAL with the appropriate sign, and the global value errno is set to ERANGE.

You can modify error handling for these functions using the function matherr.

Portability
cosh is ANSI. coshf is an extension.