# JavaScript Math asin() Method

The Math.asin( ) method is used to return the arcsine of a number in radians. The Math.asin() method returns a numeric value between -pi/2 and pi/2 radians. The 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.

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

Syntax:

`Math.asin(value)`

Parameters: This method accepts a single parameter as mentioned above and described below:

• value: This parameter holds a number in radians whose arcsine you want to find.

Returns: The Math.asin() method returns the arcsine of the given number in radians.

Below is an example of the Math asin( ) Method.

Example 1: In this example, we will return the asin of 1 using the Math asin( ) Method.

 `<``script` `type``=``"text/javascript"``> ` `    ``console.log("When 1 is passed as a parameter: " ` `                    ``+ Math.asin(1)); ` ``

Output:

`When 1 is  passed as a parameter: 1.5707963267948966`

Example 2: When -1 is passed as a parameter.

 ``

Output:

`When -1 is  passed as a parameter: -1.5707963267948966`

Example 3: When 2 is passed as a parameter.

 ``

Output:

`When 2 is  passed as a parameter: NaN`

Example 4: When 0.5 is passed as a parameter.

 ``

Output:

`When 0.5 is  passed as a parameter: 0.5235987755982989`

We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.

Supported Browsers:

• Google Chrome 1 and above
• Internet Explorer 12 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above