olymmath

KöMaL 2010 B4270

    Let ABCDEF be a hexagon inscribed in a circle. Prove that AD.BE.CFAD^. BE^. CF=AB.DE.CFAB^. DE^. CF+BC.EF.ADBC^. EF^. AD+CD.FA.BECD^. FA^. BE+AB.CD.EFAB^. CD^. EF+BC.DE.FABC^. DE^. FA.

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