# fresnelc
> Compute the [Fresnel integral][fresnel-integral] C(x).
The [Fresnel integral][fresnel-integral] C(x) is defined as
Some sources define C(x) using t2 for the argument of the cosine. To get this function, multiply the computed integral by `√(π/2)` and multiply the argument `x` by `√(2/π)`.
## Usage
```javascript
var fresnelc = require( '@stdlib/math/base/special/fresnelc' );
```
#### fresnelc( x )
Computes the [Fresnel integral][fresnel-integral] C(x).
```javascript
var v = fresnelc( 0.0 );
// returns ~0.0
v = fresnelc( 1.0 );
// returns ~0.780
v = fresnelc( Infinity );
// returns ~0.5
v = fresnelc( -Infinity );
// returns ~-0.5
v = fresnelc( NaN );
// returns NaN
```
## Examples
```javascript
var linspace = require( '@stdlib/array/linspace' );
var fresnelc = require( '@stdlib/math/base/special/fresnelc' );
var x = linspace( 0.0, 10.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( fresnelc( x[ i ] ) );
}
```
[fresnel-integral]: https://en.wikipedia.org/wiki/Fresnel_integral
