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For the ellipse (x^(2))/(9)+(y^(2))/(4)...

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

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