👉 The arctangent function, denoted by "arctan", is a mathematical function that returns an angle in radians from its coordinates on the unit circle. It's often used to find the angle of a point on a circle given its coordinates on the coordinate plane. The arctangent is defined as: arctan(x) = y / x where y is the angle measured counterclockwise from the positive x-axis, and x is the value of the function at that point