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If P(x1,y1),Q(x2,y2) and R(x3, y3) ar...

If `P(x_1,y_1),Q(x_2,y_2)` and `R(x_3, y_3)` are three points on `y^2 =4ax` and the normal at PQ and R meet at a point, then the value of `(x_1-x_2)/(y_3)+(x_2-x_3)/(y_1)+(x_3-x_1)/(y_2)=`

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