NAME

cosh, coshf, coshl - hyperbolic cosine function

SYNOPSIS

#include <math.h>

double cosh(double x);

float coshf(float x);

long double coshl(long double x);

Link with -lm.

DESCRIPTION

The cosh() function returns the hyperbolic cosine of x, which is defined mathematically as (exp(x) + exp(-x)) / 2.

CONFORMING TO

SVID 3, POSIX, 4.3BSD, ISO 9899 (C99). The float and the long double variants are C99 requirements.

SEE ALSO

acosh(3), asinh(3), atanh(3), ccos(3), sinh(3), tanh(3)