JavaScript Math.asin() Method

1. Syntax of JavaScript Math.asin() Method
2. Example Codes: Use the Math.asin() Method
3. Example Codes: Use the Math.asin() Method With Different Ranges

The JavaScript Math.asin() method returns a numeric value representing the opposite sine of a number in radians. The value is between -PI/2 to PI/2, and the range is -1 to 1.

Syntax of JavaScript Math.asin() Method

Math.asin(num)

Parameters

Return

The Math.asin() method returns the opposite sine of a number in radians from a value between -PI/2 to PI/2. This method will return NaN if something is passed that is less than -1 or greater than 1.

Example Codes: Use the Math.asin() Method

const result1 = Math.asin(-1)
const result2 = Math.asin(0)
const result3 = Math.asin(1)

console.log(result1)
console.log(result2)
console.log(result3)

Output:

-1.5707963267948966
0
1.5707963267948966

We took three different numbers, -1, 0, and 1, and passed them as the parameter of the Math.asin() method. This method returned the opposite sine of these numbers in radians.

Example Codes: Use the Math.asin() Method With Different Ranges

const result1 = Math.asin(-3)
const result2 =Math.asin(3)

console.log(result1)
console.log(result2)

Output:

NaN
NaN

This method returns NaN for both cases. The reason is that for the first case, the number is smaller than -1, and for the second case, the number is greater than 1.