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If the curves (x^2)/4+y^2=1 and (x^2)/(a...

If the curves `(x^2)/4+y^2=1` and `(x^2)/(a^2)+y^2=1` for a suitable value of `a` cut on four concyclic points, the equation of the circle passing through these four points is (a)`x^2+y^2=2` (b) `x^2+y^2=1` (c)`x^2+y^2=4` (d) none of these

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