[" 9.If the two circles "x^(2)+y^(2)+2gx...

[" 9.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 "],[[" 1) "x^(2)+y^(2)=c^(2)," 2) "x^(2)-y^(2)=2c],[" 3) "x-y^(2)=c^(2)," 4) "x^(2)+y^(2)=2c^(2)]]

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