Javascriptatan () calculates the arc tangent of a number.

The javascriptatan () method returns the arc tangent of a number. If the calculated value is not a number, the function returns NaN. This article describes the basic syntax and usage of atan through examples. For more information about the coders, see. The atan method returns the arc tangent of a number.

Basic syntax

Math. atan (number)

The required number parameter is a numerical expression for calculating the arc tangent.

Return Value

The return value is the arc tangent of the numeric parameter. The arc tangent value is the radian value between-PI/2 and PI/2.

Instance: