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JavaScript - Math.cos() Method



The JavaScript Math.cos() method returns trigonometric cosine of an angle (angle should be in radians). In the graph below, cos(x) vs x is plotted.

Cos Function

Syntax

Math.cos(x);

Parameters

x Specify the angle in radian.

Return Value

Returns the trigonometric cosine of an angle.

Example:

In the example below, Math.cos() method is used to find out the trigonometric cosine of an angle.

//Math.PI - value of PI from Math object
var pi = Math.PI;
var txt;

txt = "Math.cos(pi/6) = " + Math.cos(pi/6) + "<br>";
txt = txt + "Math.cos(pi/4) = " + Math.cos(pi/4) + "<br>";
txt = txt + "Math.cos(pi/3) = " + Math.cos(pi/3) + "<br>";

The output (value of txt) after running above script will be:

Math.cos(pi/6) = 0.8660254037844387
Math.cos(pi/4) = 0.7071067811865476
Math.cos(pi/3) = 0.5000000000000001

❮ JavaScript - Math Object

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