cosh, coshf—hyperbolic cosineSynopsis
#include <math.h>
double cosh(double x);
float coshf(float x)
Description
cosh computes the hyperbolic cosine of the argument x.
cosh(x) is defined as
(exp(x) + exp(-x))/2
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.