Tangent

Evaluate the tangent of a number.

The tangent is defined as

tangent x equals StartFraction sine x Over cosine x EndFraction

Usage

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

tan( x )

Evaluates the tangent of a number (in radians).

var v = tan( 0.0 );
// returns ~0.0

v = tan( -Math.PI/4.0 );
// returns ~-1.0

v = tan( Math.PI/4.0 );
// returns ~1.0

v = tan( NaN );
// returns NaN

Examples

var linspace = require( '@stdlib/math/utils/linspace' );
var PI = require( '@stdlib/constants/math/float64-pi' );
var tan = require( '@stdlib/math/base/special/tan' );

var x = linspace( -PI/2.0, PI/2.0, 100 );
var i;

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