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XK-TST 2022 Problem 3

    Let ABCABC be a triangle and DD point on side BCBC such that ADAD is angle bisector of angle ∠BAC\angle BAC . Let EE be the intersection of the side ABAB with circle ω1\omega_1 which has diameter CDCD and let FF be the intersection of the side ACAC with circle ω2\omega_2 which has diameter BDBD . Suppose that there exist points P∈ω1P\in\omega_1 and Q∈ω2Q\in\omega_2 such that E,P,QE, P, Q and FF are collinear and on this order. Prove that AD,BQAD, BQ and CPCP are concurrent.

    Proposed by Dorlir Ahmeti, Kosovo and Noah Walsh, U.S.A.

    Dataset text AI-MO AoPS. Quoted with source.

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