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.

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