ArcTan- Returns the arctangent of a number

Function that returns the arctangent of a number, angle expressed in radians. - ArcTan(X): float Parameters: - (float) X: tangent for which to get the angle. Description: Use the ArcTan function to derive the arctangent of a number, an angle expressed in radians. This instruction is a trigonometric function, inverse of the tangent function (Tan) and having as values the angles expressed in radians. The resulting angle is expressed in radians with a value between -PiGreek/2 and PiGreek/2. To express the arc tangent in degrees, multiply the result by 180/PiGreek.