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The locus of the point such that normals...

The locus of the point such that normals drawn at the point of contact of the tangents drawn from the point to the parabola, are such that the slope of one is double the slope of the other is : (A) `y^2 = 9/2 ax` (B) `x^2 = 4ay` (C) `y^2 = 9/4 ax` (D) `x^2 = 9/4 ay`

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