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In the circle O, chords AB, AC, and AD intersect chord EF at G, H, and M, respectively, so that EG = FM, as shown in the figure. If AG = c1, GB =c2, AM = c3, MD = c4, AH = a1, HC = a2, GH = b1, and HM = b2, prove that .
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Post or view a solution to the problem 1190 Last updated: Feb 24, 2016