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The straight lines joining any point `P` on the parabola `y^2=4a x` to the vertex and perpendicular from the focus to the tangent at `P` intersect at `Rdot` Then the equation of the locus of `R` is `x^2+2y^2-a x=0` `2x^2+y^2-2a x=0` `2x^2+2y^2-a y=0` (d) `2x^2+y^2-2a y=0`

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