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KMO 2022 Problem 2

    In a scalene triangle ABCABC , let the angle bisector of AA meets side BCBC at DD . Let E,FE, F be the circumcenter of the triangles ABDABD and ADCADC , respectively. Suppose that the circumcircles of the triangles BDEBDE and DCFDCF intersect at P(≠D)P(\neq D) , and denote by O,X,YO, X, Y the circumcenters of the triangles ABC,BDE,DCFABC, BDE, DCF , respectively. Prove that OPOP and XYXY are parallel.

    Dataset text AI-MO AoPS. Quoted with source.

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