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Consider a parabla y^(2)=8x. If PSQ is a...

Consider a parabla `y^(2)=8x`. If `PSQ` is a focal chord of the parabola whose vertex is `A` and focus `S,V` being the middle point of the chord such that `PV^(2)=AV^(2)+lamda.AS^(2)` where `lamda` is______

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Using property of parabola
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