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    Math.cos()

    Summary

    The Math.cos() function returns the cosine of a number.

    Syntax

    Math.cos(x)

    Parameters

    x
    A number given in unit of radians.

    Description

    The Math.cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle.

    Because cos() is a static method of Math, you always use it as Math.cos(), rather than as a method of a Math object you created (Math is not a constructor).

    Examples

    Example: Using Math.cos()

    Math.cos(0);           // 1
    Math.cos(1);           // 0.5403023058681398
    
    Math.cos(Math.PI);     // -1
    Math.cos(2 * Math.PI); // 1
    

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Standard Initial definition. Implemented in JavaScript 1.0.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Math.cos' in that specification.
    Standard  
    ECMAScript 6 (ECMA-262)
    The definition of 'Math.cos' in that specification.
    Release Candidate  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Contributors to this page: evilpie, Sheppy, sransara, Marcoos, fscholz, Mingun, ethertank, Mgjbot, Maian, Dria, Kyodev
    Last updated by: Mingun,