# sincos
> Simultaneously compute the [sine][@stdlib/math/base/special/sin] and [cosine][@stdlib/math/base/special/cos] of a number.
## Usage
```javascript
var sincos = require( '@stdlib/math/base/special/sincos' );
```
#### sincos( \[out,] x )
Simultaneously computes the [sine][@stdlib/math/base/special/sin] and [cosine][@stdlib/math/base/special/cos] of a `number` (in radians).
```javascript
var v = sincos( 0.0 );
// returns [ ~0.0, ~1.0 ]
v = sincos( 3.141592653589793/2.0 );
// returns [ ~1.0, ~0.0 ]
v = sincos( -3.141592653589793/6.0 );
// returns [ ~-0.5, ~0.866 ]
```
By default, the function returns the sine and cosine as a two-element `array`. To avoid extra memory allocation, the function supports providing an output (destination) object.
```javascript
var Float64Array = require( '@stdlib/array/float64' );
var out = new Float64Array( 2 );
var v = sincos( out, 0.0 );
// returns [ ~0.0, ~1.0 ]
var bool = ( v === out );
// returns true
```
## Examples
```javascript
var linspace = require( '@stdlib/array/linspace' );
var TWO_PI = require( '@stdlib/constants/float64/two-pi' );
var sincos = require( '@stdlib/math/base/special/sincos' );
var x = linspace( 0.0, TWO_PI, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( sincos( x[ i ] ) );
}
```
[@stdlib/math/base/special/sin]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/sin
[@stdlib/math/base/special/cos]: https://www.npmjs.com/package/@stdlib/math/tree/main/base/special/cos