Arctangent [Atan]

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The Arctangent function calculates the arctangent of a value in radians. Parameters ------------------ Radians     The value in radians to be used in the calculation. Function Value ------------------------ The arctangent is the angle whose tangent is the given number. The returned angle is given in radians in the range -pi/2 to pi/2. The functions DegreesToRadians and RadiansToDegrees can be used to use this function with values in degrees. To calculate the arctangent of a pair of virtual x,y coordinates, use Arctangent (x,y).