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P(theta) and D(pi/2+theta) are two point...

`P(theta)` and `D(pi/2+theta)` are two points on the ellipse `x^2/a^2+y^2/b^2=1`. Show that the locus of the point of intersection of tangents at P and Q to the ellipse is `x^2/a^2+y^2/b^2=2`

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