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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) +2fy +lamda =0`, to the circle `x^(2) +y^(2)+2fy+mu= 0` where `mu gt lamda gt 0`, is

A

`sqrt(mu-lamda)`

B

`sqrt(mu +lamda)`

C

`sqrt(mu^(2)-lamda^(2))`

D

`mu+lamda`

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The correct Answer is:
A
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