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The length of the tangents drawn from an...

The length of the tangents drawn from any point on the circle `x^2+y^2+2gx+2fy+C_1=0` to the circle `x^2+y^2+2gx+2fy+C_2=0` is

A

`sqrt(C_1^2+C_2^2)`

B

`sqrt(C_2-C_1)`

C

`C_1+C_2`

D

`C_1=C_2`

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