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# acos() function of math.h in C

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acos() function of math.h in C: Learn how to find the acos (Arc Cosine) of a number in C with an Example?
Submitted by Manu Jemini, on April 01, 2018

This function provides the functionality to calculate the arc cosine of a number. The Number should be less than equal to 1 and greater than equal to 0.

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

Example:

```    X = 0.2
The function will return 1.369438
```

The Function is a part of the math.h library which should be included in the program before using this function.

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

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

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

// Assigning value for getting acos value
a = 0.2;

// Calculating the arc cosine of a
b = acos(a);

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

return 0;
}
```

Output

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