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Math.atan Function (JavaScript)

Returns the arctangent of a number.

Math.atan(number)

The required number argument is a numeric expression for which the arctangent is needed.

The return value is the arctangent of the number argument, in radians.

Applies To: Math Object (JavaScript)

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

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