Question

Give an example of arctan .I want to know about it ....

Answer 1

arctan(x) represents the inverse of the tangent function. ... The angle returned by this function is measured in radians, not in degrees. For example, the result π represents an angle of 180o.

Answer 2

arctan is inverse trigonometric function

if y=tanx then x is called arctan(y) represented as $x=tan^{-1} y$

tan(45°)=1 ⇒ arctan(1) = 45°