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[" The straight line joining any point "P" on the parabola "y^(2)=4ax" to the vertex and perpendicula "],[" from the focus to the tangent at "P" ,intersect at "R" ,then the equation of the locus of "R" is "],[[" (A) "x^(2)+2y^(2)-ax=0," (B) "2x^(2)+y^(2)-2ax=0" (C) "2x^(2)+2y^(2)-ay=0" (D) "2x^(2)+y^(2)-2ay=0]]

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