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[" If the circles "x^(2)+y^(2)+2gx+2fv=0...

[" If the circles "x^(2)+y^(2)+2gx+2fv=0" and "x^(2)+y^(2)+2g'x+2f'y=0" rouch each other then "],[[" (1) "fg=f'g'," 2) "fg'=gf'+g'," 3) "fg'=gf'," 4) "f+g=f+g]]

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