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From a point O on the circle x^2+y^2=d^2...

From a point O on the circle `x^2+y^2=d^2`, tangents OP and OQ are drawn to the ellipse `x^2/a^2+y^2/b^2=1` `(a>b)`.Show that the locus of the mid point of the chord PQ describes the curve `x^2+y^2=d^2[x^2/a^2+y^2/b^2]^2`.

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The correct Answer is:
`25 [(x^(2))/(4)+(y^(2))/(1)]^(2)`
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