COSH(3) Library Functions Manual COSH(3)

cosh, coshf
hyperbolic cosine function

Math Library (libm, -lm)

#include <math.h>

double
cosh(double x);

float
coshf(float x);

The cosh() and coshf() functions compute the hyperbolic cosine of x.

If the magnitude of x is too large, cosh(x) and coshf(x) return Inf and sets the global variable errno to ERANGE.

acos(3), asin(3), atan(3), atan2(3), cos(3), math(3), sin(3), sinh(3), tan(3), tanh(3)

The cosh() function conforms to ANSI X3.159-1989 (“ANSI C89”).
May 2, 1991 NetBSD 9.2