1.

The tangent at a point P(theta) to the ellipse x^2/a^2+y^2/b^2=1 cuts the auxilliary circle at Q and R. If QR subtend a right angle atC (centre) then show that e=1/sqrt(1+sin^2 theta)

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ANSWER :`(SQRT((a^2-R^2)(r^2-b^2)))/r`


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