## Description

`float atan2`

(float y, float x);

This function calculates the arc tangent of the two variables x and y. It is similar to calculating the
arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

The function returns the result in radians, which is between -PI and PI (inclusive).

See also **acos()** and **atan()**.