#      
## Overview
The `cosh()` function in C++ is used to return the hyperbolic cosine of an angle given in radians.

Mathematically:

Cosh(x) = $\frac{(e^x) + (1/e^x)}{2}$

## Syntax
```
double cosh(double x);
float cosh(float x);
long double cosh(long double x);
```
## Parameter value
The `cosh()`  function takes a single argument `x`, which represents the hyperbolic angle in radians.

## Return value
The `cosh()` function returns the hyperbolic cosine of the argument passed to it.

## Example



#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    // creating a variable
    double x = 5.25, result;

    // applying the cosh() function
    result = cosh(x);

    // printing our output
    cout << "cosh(x) = " << result << endl;

return 0;
}

## Explanation
* In line 6, we declare a variable `x`.
* In line 10, we call the `cosh()` function for the variable `x` and assign the output to a new variable `result`.
* In line 13, we print the variable `result`.


What is the cosh() function in C++?

The cosh() function in C++ calculates the hyperbolic cosine of a given angle in radians.