# asin
> Compute the [arcsine][arcsine] of a number.
## Usage
```javascript
var asin = require( '@stdlib/math/base/special/asin' );
```
#### asin( x )
Computes the [arcsine][arcsine] of a `number` (in radians).
```javascript
var v = asin( 0.0 );
// returns 0.0
v = asin( -3.141592653589793/6.0 );
// returns ~-0.551
```
The domain of `x` is restricted to `[-1,1]`. If `|x| > 1`, the function returns `NaN`.
```javascript
var v = asin( -3.14 );
// returns NaN
```
## Examples
```javascript
var linspace = require( '@stdlib/array/linspace' );
var asin = require( '@stdlib/math/base/special/asin' );
var x = linspace( -1.0, 1.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( asin( x[ i ] ) );
}
```
[arcsine]: https://en.wikipedia.org/wiki/Inverse_trigonometric_functions