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A and B are two points on the parabola y...

A and B are two points on the parabola `y^(2) = 4ax` with vertex O. if OA is perpendicular to OB and they have lengths `r_(1)` and `r_(2)` respectively, then the valye of `(r_(1)^(4//3)r_(2)^(4//3))/(r_(1)^(2//3)+r_(2)^(2//3))` is

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