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The length of the tangent drawn from any...

The length of the tangent drawn from any point on the circle `x^2 + y^2 + 2gx + 2fy + lambda = 0` to the circle `x^2 + y^2 + 2gx + 2fy + mu=0` is : (A) `sqrt(mu-lambda)` (B) `sqrt(lambda-mu)` (C) `sqrt(mu+lambda)` (D) none of these

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