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P(1) and P(2) are the lengths of the per...

`P_(1)` and `P_(2)` are the lengths of the perpendicular from the foci on the tangent of the ellipse and `P_(3)` and `P_(4)` are perpendiculars from extermities of major axis and P from the centre of the ellipse on the same tangent, then `(P_(1)P_(2)-P^(2))/(P_(3)P_(4)-P^(2))` equals (where e is the eccentricity of the ellipse)

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