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# Covercosine

> Compute the [coversed cosine][coversed-cosine].

<section class="intro">

The [coversed cosine][coversed-cosine] is defined as

<!-- <equation class="equation" label="eq:covercosine" align="center" raw="\operatorname{covercos}(\theta) = 1 + \sin \theta" alt="Coversed cosine."> -->

<div class="equation" align="center" data-raw-text="\operatorname{covercos}(\theta) = 1 + \sin \theta" data-equation="eq:covercosine">
    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@bb29798906e119fcb2af99e94b60407a270c9b32/lib/node_modules/@stdlib/math/base/special/covercos/docs/img/equation_covercosine.svg" alt="Coversed cosine.">
    <br>
</div>

<!-- </equation> -->

</section>

<!-- /.intro -->

<section class="usage">

## Usage

```javascript
var covercos = require( '@stdlib/math/base/special/covercos' );
```

#### covercos( x )

Computes the [coversed cosine][coversed-cosine] (in radians).

```javascript
var v = covercos( 0.0 );
// returns 1.0

v = covercos( 3.141592653589793/2.0 );
// returns 2.0

v = covercos( -3.141592653589793/6.0 );
// returns 0.5
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint no-undef: "error" -->

```javascript
var linspace = require( '@stdlib/array/linspace' );
var TWO_PI = require( '@stdlib/constants/float64/two-pi' );
var covercos = require( '@stdlib/math/base/special/covercos' );

var x = linspace( 0.0, TWO_PI, 100 );
var i;

for ( i = 0; i < x.length; i++ ) {
    console.log( covercos( x[ i ] ) );
}
```

</section>

<!-- /.examples -->

<section class="links">

[coversed-cosine]: https://en.wikipedia.org/wiki/Versine

</section>

<!-- /.links -->