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# atan() function of math.h in C

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In this article, we are going to learn about the use atan() function of math.h header file in C language and use it with the help of an example.
Submitted by Manu Jemini, on April 01, 2018

This function provides the functionality to calculate the arc tan of a value. The value should be less than equal to π/2 and greater than equal to -π/2.

This function takes a single parameter as the number whose arc tan value needs to be calculated and return the value which is the result of the calculation.

Example:

```    X = 0.7
The function will return 0.610726
```

This function is a part of math.h library and it must be included in the program.

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## math.h - atan() function Example in C

```#include <stdio.h>
#include <math.h>

int main()
{
// Defining variables
double a,b;

// Assigning value for getting atan value
a = 0.7;

// Calculating the arc tangent of a
b = atan(a);

// Displaying the result for user
printf("The calculated value is: %lf \n\n", b);

return 0;
}
```

Output

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