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If the circle x ^(2) + y^(2) + 2gx + 2fy...

If the circle `x ^(2) + y^(2) + 2gx + 2fy+ c=0` touches X-axis, then

A

`g=f`

B

`g^2=c`

C

`f^2=c`

D

`g^2+f^2=c`

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