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IR-TST 2023 Problem 2

    ABCDABCD is cyclic quadrilateral and OO is the center of its circumcircle. Suppose that AD∩BC=EAD \cap BC = E and AC∩BD=FAC \cap BD = F. Circle ω\omega is tanget to line ACAC and BDBD. PQPQ is a diameter of ω\omega that FF is orthocenter of EPQEPQ. Prove that line OEOE is passing through center of ω\omega

    Proposed by Mahdi Etesami Fard

    Dataset text AoPS wiki problems. Quoted with source.

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