cosh

Syntax

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

Description

This function computes the hyperbolic cosine of x.

Return Value

The hyperbolic cosine of x. If the value of x is a NaN, the return value is NaN and errno is set to EDOM. If the value of x is so large that the result would overflow a double, the return value is Inf and errno is set to ERANGE. If x is either a positive or a negative infinity, the result is +Inf, and errno is not changed.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001