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# What is acos() in Perl?

harris910

The acos() functionalso called the arc cosine function calculates the inverse cosine of a number. To be more specific, it returns the inverse cosine of a number in radians.

Figure 1 shows the mathematical representation of the acos() function, and Figure 2 shows the visual representation of the acos() function.

Figure 1: Mathematical representation of inverse cosine function
Figure 2: Visual representation of inverse cosine function

To convert radians to degrees, use the following function:

rad2deg(angleInRadians)


## Syntax

acos(num)


### Parameter

This function requires a number as a parameter.

### Return value

This function returns the inverse cosine of a number (in radians) set as a parameter. The return value lies in the interval of [0, pi] radians.

## Example

#this header for rad2deg() function
use Math::Trig;

$a = acos(0.5); print "acos(0.5):$a Radians\n";

$b = acos(-0.5); print "acos(-0.5):$b Radians\n";

#applying acos() and then converting the result in radians to degrees
$c = rad2deg(acos(0.5)); print "acos(0.5):$c Degrees\n";



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