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If the normals to the parabola y^2=4a x ...

If the normals to the parabola `y^2=4a x` at three points `P ,Q ,a n dR` meet at `A ,a n dS` is the focus, then `S PdotS qdotS R` is equal to `a^2S A` (b) `S A^3` (c) `a S A^2` (d) none of these

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The correct Answer is:
`a(SA)^2`
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