# Math.asin Function (JavaScript)

Returns the arcsine of a number.

## Syntax

```
Math.asin(number)
```

## Remarks

The required `number`

argument is a numeric expression for which the arcsine is needed.

The return value is the arcsine of the `number`

argument, in radians.

**Applies To**: Math Object

## Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

## See Also

Math.acos Function

Math.atan Function

Math.cos Function

Math.sin Function

Math.tan Function

Math Object