The length of the tangent drawn from any point on the circle x^2+y^2+2fy+\lambda=0 to the circle x^2+y^2+2fy+\mu=0, where \mu>\lambda>0, is

KEAM 2011 Math Paper

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The length of the tangent drawn from any point on the circle x2+y2+2fy+λ=0 to the circle x2+y2+2fy+µ=0, where µ>λ>0, is

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