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School of mathematics oa
After studying the four-point * * * circle and proving △ ACD △ AEB, we can know that A, O, B, D, A, O, C and E have four-point * * * circles respectively.
Therefore, ∠ AOD = ∠ Abd = 60, ∠ AOE = ∠ AISI = 60.
That is, OA divides equally ∠DOE.
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