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The locus of the point of intersection of the tangents at the extremities of the chords of the ellipse `x^2+2y^2=6` which touch the ellipse `x^2+4y^2=4,` is `x^2+y^2=4` (b) `x^2+y^2=6` `x^2+y^2=9` (d) None of these

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