cosh, coshf, coshl - hyperbolic cosine function
#include <math.h>
double cosh(double x);
float coshf(float x);
long double coshl(long double x);Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
These functions return the hyperbolic cosine of x, which is defined mathematically as:
cosh(x) = (exp(x) + exp(-x)) / 2On success, these functions return the hyperbolic cosine of x.
If x is a NaN, a NaN is returned.
If x is +0 or -0, 1 is returned.
If x is positive infinity or negative infinity, positive infinity is returned.
If the result overflows, a range error occurs, and the functions return +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, respectively.