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The returns the inverse cosine of a number. To be more specific, it returns the inverse cosine of a number in radians.

`acos()`

function`arc cosine`

functionFigure 1 shows the *mathematical representation* of the `acos()`

function and Figure 2 shows the *visual representation* of the `acos()`

function.

Note: The

`math.h`

header file is required for this function.

To convert `radians`

to `degrees`

, use the following formula.

```
degrees = radians * ( 180.0 / PI )
```

```
double acos(double num)
```

This function requires a number as a parameter. The parameter must be a double value between -1 and 1.

- -1 <= parameter <= 1

`acos()`

returns the `inverse cosine`

of a number (radian double value) that is sent as a parameter. The return value lies in interval `[0, pi]`

radians.

#include<stdio.h> //header file #include<math.h> int main() { //positive number in radians printf("The arc cosine of %lf is %lf radians \n", 0.5, acos(0.5)); // negative number in radians printf("The arc cosine of %lf is %lf radians \n", -0.5, acos(-0.5)); //applying acos() and then converting the result in radians to degrees // radians = 0.5 // PI = 3.14159265 double result=acos(0.5) * (180.0 / 3.14159265); printf("The arc cosine of %lf is %lf degrees \n", 0.5, result); }

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c

math

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