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[" Circles "x^(2)+y^(2)+2gx+2fy=0" and "x^(2)+y^(2)+2g'x+2f'y=0" touch externally,if "],[[" (a) "f'g=g'f," (b) "fg=f'g'," (c) "f'g'+fg=0," (d) "f'g+g'f=0]]

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