The ATAN function returns the arctangent (inverse tangent) of the given number. Arctangent is nothing but an angle and its tangent value is a number. Note: The returned angle is given in the range -pi/2 to pi/2 (in radians).
=ATAN(Number) Whereas "Number" is the tangent of the angle we want to find.
Let us find the arctangent value of the given number, using the ATAN function, with the help of the below video.