Math.asin( ) In JavaScript

The Math.asin( ) function in JavaScript is used to return the arcsine of a number in radians.

Math.asin(x)=arcsin(x)=unique y,where y belongs to [-pi/2;pi/2] such that sin(y)=x

The Math.asin() method returns a numeric value between -pi/2 and pi/2 radians.
asin() is a static method of Math, therefore, it is always used as Math.asin(), rather than as a method of a Math object created.

Syntax:

Math.asin(value)

Parameters Used:
Value:A number in radians who arcsine you want to find.

Return Value:
The Math.asin() function returns the arcsine of the given number in radians.

Examples:

Input : Math.asin(1)
Output : 1.5707963267948966
     
Input : Math.asin(-1)
Output : -1.5707963267948966

Input : Math.asin(2)
Output : NaN

Input : Math.asin(0.5)
Output : 0.5235987755982989

1. When 1 is passed as a parameter.

   <script type="text/javascript">    document.write("Output : " + Math.asin(1)); </script>

   Output:

   Output : 1.5707963267948966

2. When -1 is passed as a parameter.

   <script type="text/javascript">    document.write("Output : " + Math.asin(-1)); </script>

   Output:

   Output : -1.5707963267948966

3. When 2 is passed as a parameter.

   <script type="text/javascript">    document.write("Output : " + Math.asin(2)); </script>

   Output:

   Output : NaN

4. When 0.5 is passed as a parameter.

   <script type="text/javascript">    document.write("Output : " + Math.asin(0.5)); </script>

   Output:

   Output : 0.5235987755982989