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Let P be a point on the ellipse x^2/100 ...

Let `P` be a point on the ellipse `x^2/100 + y^2/25 =1` and the length of perpendicular from centre of the ellipse to the tangent to ellipse at `P` be `5sqrt(2) and F_1 and F_2` be the foci of the ellipse, then `PF_1.PF_2`.

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