JavaScript asin – Find Arcsine and Inverse Sine of Number

To find the arcsine, or inverse sine, of a number, we can use the JavaScript asin() function from the math module.

Math.asin(x)

In JavaScript, we can easily use trigonometric functions with the JavaScript math module. The JavaScript math module allows us to perform trigonometry easily.

With the JavaScript math module, we can find the arcsine of a number easily.

To find the arcsine of a number, we use the math asin() function.

Below is the JavaScript syntax to find the inverse sine of a number.

Math.asin(x)

The input to the asin() function must be a numeric value between -1 and 1. The return value will be a numeric value between -pi/2 and pi/2 radians.

console.log(Math.asin(0.5))
console.log(Math.asin(0))
console.log(Math.asin(-0.75))

// Output: 
0.5235987755982989
0.0
-0.848062078981481

Finding the Inverse Sine of a Number in JavaScript

Arcsine is defined as the inverse of the sine of a number.

Below, we show that if we pass a number to sin() and then call the JavaScript asin() function, we get back the same number.

console.log(Math.asin(math.sin(math.PI/3)))
console.log(Math.PI/3)

// Output: 
1.0471975511965976
1.0471975511965976

Hopefully this article has been beneficial for you to understand how to use the math asin() function in Javascript to find the arcsine of a number.