let d be the perpendicular distance from the center of an ellipse

x square\a square + y square\b square=1 to the tangent drawn at the point p on the ellipse. If f1 and f2 are two focii of the ellipse, then show that

(PF1 +PF2)square = 4a square (1- b square\d square)

sakshi jain , 13 Years ago

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