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# What is asin() in Perl?

harris910

The asin() function, also called the arc sine function, calculates and returns the inverse sine of a number.

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

Figure 1 below shows the mathematical representation of the asin() function.

Figure 1: Mathematical representation of inverse sine function

Figure 2 shows the visual representation of the asin() function.

Figure 2: Visual representation of inverse sine function

### Methodology

To convert radians to degrees, use the following function:

rad2deg(angleInRadians)


### Syntax

asin(num)


### Parameter

This function requires a number as a parameter.

### Return value

asin() returns the inverse sine of a number (in radians) that is set as a parameter. The return value lies in the interval [-pi/2, pi/2] radians.

### Code

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

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

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

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


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