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atan2 function

atan2 diagram 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).

atan2 returns:

The arc tangent of $y/$x in radians.