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If s,s' are the length of the perpendicu...

If `s,s'` are the length of the perpendicular on a tangent from the foci . `a,a'` are those from the vertices, c is that from the centre and e is the eccentricity of the ellipse, `x^2/a^2+y^2/b^2=1`, then prove that `(ss'-c^2)/(aa'-c^2)=e^2`

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