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: this function accepts a single parameter which is a number in radians who arcsine you want to find.

Returns: 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