1.

If the two circles x^(2)+y^(2)+2gx+c=0 and x^(2)+y^(2)-2fy-c=0 have equal radius then locus of (g,f) is

Answer»

`x^(2)+y^(2)=c^(2)`
`x^(2)-y^(2)=2C`
`x-y^(2)=c^(2)`
`x^(2)+y^(2)=2c^(2)`

ANSWER :B


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