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

A

`sqrt(mu - lambda)`

B

`sqrt(mu + lambda)`

C

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

D

`mu + lambda`

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The correct Answer is:
A
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