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Prove that the radical axis of the circles x^2+y^2+2gx +2fy+c=0 and x^2+y^2+2g'x + 2f'y+c'=0 is the diameter of the later circle (or the former bisects the circumference of the later ) if 2g'(g-g')+2f'(f-f')=c-c' |
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