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A tangent to the ellipse x^(2)+4y^(2)=4 ...

A tangent to the ellipse `x^(2)+4y^(2)=4` meets the ellipse `x^(2)+2y^(2)=6a` P and Q . Prove that the tangents at P and Q the ellipse `x^(2)+2y^(2)=6` are the right angles.

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