# how atan work c++

#### How `atan`

works in C++

The `atan`

function in C++ is used to calculate the arctangent of a value. Here's an explanation of how it works:

**Definition of**:`atan`

function- The
`atan`

function returns the arctangent of its argument, which is the angle in radians whose tangent is the specified number. It is defined in the

`<cmath>`

header in C++.**Usage**:The

`atan`

function is commonly used in trigonometry and geometry to calculate angles.**Example**:Here's an example of how the

`atan`

function can be used in C++:`#include <iostream> #include <cmath> int main() { double x = 1.0; double result = atan(x); std::cout << "The arctangent of " << x << " is " << result << " radians." << std::endl; return 0; }`

**Explanation of the Example**:- In this example, the
`atan`

function is used to calculate the arctangent of the value`1.0`

. The result is then printed to the console.

**Additional Information**:- The value returned by
`atan`

is in the range of -π/2 to π/2 radians.