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Showing content from https://cplusplus.com/reference/cmath/cosh/ below:

function

cosh

     double cosh  (double x);      float coshf (float x);long double coshl (long double x);

     double cosh (double x);      float cosh (float x);long double cosh (long double x);

     double cosh (double x);      float cosh (float x);long double cosh (long double x);     double cosh (T x);           // additional overloads for integral types

Compute hyperbolic cosine

Returns the hyperbolic cosine of x.

Header

<tgmath.h>

provides a type-generic macro version of this function.

Parameters

x: Value representing a hyperbolic angle.

Return Value Hyperbolic cosine of x.
If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL) with the proper sign, and an overflow range error occurs:

If an overflow

range error

occurs, the global variable

errno

is set to

ERANGE

Example

/* cosh example */
#include <stdio.h>      /* printf */
#include <math.h>       /* cosh, log */

int main ()
{
  double param, result;
  param = log(2.0);
  result = cosh (param);
  printf ("The hyperbolic cosine of %f is %f.\n", param, result );
  return 0;
}

Output:

The hyperbolic cosine of 0.693147 is 1.250000.