# cosh() function in C++ STL

The cosh() function returns the hyperbolic cosine of an angle given in radians. It is an inbuilt function in C++ STL.

The syntax of the cosh() function is given as follows.

cosh(var)

As can be seen from the syntax, the function cosh() accepts a parameter var of data type float, double or long double. It returns the hyperbolic cosine of var.

A program that demonstrates cosh() in C++ is given as follows −

## Example

Live Demo

#include <iostream>
#include <cmath>
using namespace std;
int main() {
double d = 5, ans;
ans = cosh(d);
cout << "cosh("<< d <<") = " << ans << endl;
return 0;
}

## Output

cosh(5) = 74.2099

In the above program, first the variable d is initialized. Then hyperbolic cosine of d is found using cosh() and stored in ans. Finally the value of ans is displayed. This is demonstrated by the following code snippet.

double d = 5, ans;
ans = cosh(d);
cout << "cosh("<< d <<") = " << ans << endl;

If the value is provided in degrees, it is converted to radians before using cosh() function.as it returns the hyperbolic cosine of an angle given in radians A program to demonstrate this is as follows.

## Example

Live Demo

#include <iostream>
#include <cmath>
using namespace std;
int main() {
double degree = 60, ans;
degree = degree * 3.14159/180;
ans = cosh(degree);
cout << "cosh("<<degree<<") = " << ans << endl;
return 0;
}

## Output

cosh(1.0472) = 1.60029

In the above program, the value is given in degree. So it is converted into radians and then the hyperbolic cosine is obtained using cosh(). Finally, the output is displayed. This is demonstrated by the following code snippet.

double degree = 60, ans;
degree = degree * 3.14159/180;
ans = cosh(degree);
cout << "cosh("<<degree<<") = " << ans << endl;