# cosh() function in C++ STL

### C++ STL Function : cosh()

The `cosh()` function uses a mathematical formula to calculate the hyperbolic cosine of a number. This formula involves the use of exponential functions and involves the ratio of the sides of a right triangle in a hyperbolic coordinate system.In this section, we will discuss about library function cosh() in STL which is used in C++.The Standard Template Library(STL) is a set of complete data structures and functions which can be used in C++.

## Library Function cosh() in C++

In C++ programming language, the cosh function is included in standard template library.

The range of input argument which is passed to floor function is not limited here as it can be any value such as float or long double also.

### Declaration of cosh function

```cosh(data_type x)
```

### Parameters of cosh function

The cosh function accepts a single input argument  which is the hyperbolic angle and can be a double/float or long double value.

Parameter           Description
Hyperbolic angle          This value of the parameter can be of double / float or long double type.

### Return value of cosh function

The cosh function returns the hyperbolic cosine value of the argument passed.

ParameterReturn Value
Hyperbolic cosine of the argument passedIt returns the value in double / float or long double type.

### Implementation of STL Function cosh() in C++

#### Example 1:

The following code shows the use of cosh function.

Run

```#include<bits/stdc++.h>
using namespace std;
int main()
{
double x = 4.1, result;
result = cosh(x);
cout << "cosh(4.1) = " << result << endl;
double xDegrees = 90;
x = xDegrees * 3.14159 / 180;
result = cosh(x);
cout << "cosh(90 degrees) = " << result << endl;
return 0;
}
```

#### Output:

```cosh(4.1) = 30.1784
cosh(90 degrees) = 2.50918
```

#### Example 2:

Run

```#include<bits/stdc++.h>
using namespace std;
int main()
{
double x = 3000.0, result;
result = cosh(x);
cout << "cosh(3000.0) = " << result << endl;
return 0;
}
```

#### Output:

```cosh(3000.0) = inf
```

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