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Let d be the perpendicular distance from...

Let d be the perpendicular distance from the centre of the ellipse `x^2/a^2+y^2/b^2=1` to the tangent drawn at a point P on the ellipse. If `F_1` & `F_2` are the two foci of the ellipse, then show the `(PF_1-PF_2)^2=4a^2(1-b^2/d^2)`.

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MODERN PUBLICATION-CONIC SECTIONS-EXERCISE
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