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    Math.atan()

    Summary

    The Math.atan() function returns the arctangent (in radians) of a number, that is

    Math.atan(x)=arctan(x)= the unique y[-π2;π2]such thattan(y)=x\mathtt{\operatorname{Math.atan}(x)} = \arctan(x) = \text{ the unique } \; y \in \left[-\frac{\pi}{2}; \frac{\pi}{2}\right] \, \text{such that} \; \tan(y) = x

    Syntax

    Math.atan(x)

    Parameters

    x
    A number.

    Description

    The Math.atan() method returns a numeric value between -π2-\frac{\pi}{2} and π2\frac{\pi}{2} radians.

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

    Examples

    Example: Using Math.atan()

    Math.atan(1);  // 0.7853981633974483
    Math.atan(0);  // 0
    

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Standard Initial definition. Implemented in JavaScript 1.0.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Math.atan' in that specification.
    Standard  
    ECMAScript 6 (ECMA-262)
    The definition of 'Math.atan' 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, Marcoos, fscholz, Mingun, ethertank, fred.wang, Mgjbot, Maian, Dria, Kyodev
    Last updated by: Mingun,