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Just wondering if anyone knows the difference between the two?

P is a point in the first quadrant of the co-ordinate plane, lying on the parabola x^2 = 4y. The normal to the parabola at P meets the parabola again at a point Q in the second quadrant. The tangents to the parabola at P and Q meet at a point T. If S is the focus of the parabola and if QS = 2PS...