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A tangent at a point on the circle x^2+y...

A tangent at a point on the circle `x^2+y^2=a^2` intersects a concentric circle `C` at two points `Pa n dQ` . The tangents to the circle `X` at `Pa n dQ` meet at a point on the circle `x^2+y^2=b^2dot` Then the equation of the circle is (a) `x^2+y^2=a b` (b) `x^2+y^2=(a-b)^2` (c) `x^2+y^2=(a+b)^2` (d) `x^2+y^2=a^2+b^2`

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