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If the chord joining points P(alpha) and...

If the chord joining points `P(alpha) and Q(beta)` on the ellipse `((x^2)/(a^2))+((y^2)/(b^2))=1` subtends a right angle at the vertex `A(a ,0),` then prove that `tan(a/2)tan(beta/2)=-(b^2)/(a^2)dot`

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