Vercosine

Compute the versed cosine.

The versed cosine is defined as

Usage

var vercos = require( '@stdlib/math/base/special/vercos' );

vercos( x )

Computes the versed cosine (in radians).

var v = vercos( 0.0 );
// returns 0.0

v = vercos( Math.PI/2.0 );
// returns 1.0

v = vercos( -Math.PI/6.0 );
// returns ~1.8660

Examples

var linspace = require( '@stdlib/math/utils/linspace' );
var vercos = require( '@stdlib/math/base/special/vercos' );

var x = linspace( 0.0, 2.0*Math.PI, 100 );
var i;

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