JavaScript Math asin() Method (original) (raw)

Last Updated : 12 Jul, 2024

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:

**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.

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.

JavaScript `

console.log("When -1 is passed as a parameter: " + Math.asin(-1));

`

**Output:

When -1 is passed as a parameter: -1.5707963267948966

**Example 3: When 2 is passed as a parameter.

JavaScript `

console.log("When 2 is passed as a parameter: " + Math.asin(2));

`

**Output:

When 2 is passed as a parameter: NaN

**Example 4: When 0.5 is passed as a parameter.

JavaScript `

console.log("When 0.5 is passed as a parameter: " + Math.asin(0.5));

`

**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: