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If the circlex^(2) +y^(2) + 2gx + 2fy + c = 0bisects the circumference of the circlex^(2) +y^(2) + 2g'x + 2f'y + c' = 0, them the length of the common chord of these two circles is |
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Answer» `2sqrt(g^2+f^2-c)` |
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