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A normal drawn to the parabola y^2=4a x ...

A normal drawn to the parabola `y^2=4a x` meets the curve again at `Q` such that the angle subtended by `P Q` at the vertex is `90^0dot` Then the coordinates of `P` can be (a)`(8a ,4sqrt(2)a)` (b) `(8a ,4a)` (c)`(2a ,-2sqrt(2)a)` (d) `(2a ,2sqrt(2)a)`

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