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For the ellipse x^2/9+y^2/4=1. Let O be ...

For the ellipse `x^2/9+y^2/4=1`. Let O be the centre and S and S' be the foci. For any point P on the ellipse the value of `(PS.PS'd^2)/9` (where d is the distance of O from the tangent at P) is equal to

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