cosh, coshf, coshl − hyperbolic cosine function

#include <math.h>

double cosh(double x);

float coshf(float x);

long double coshl(long double x);

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

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

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