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PL-OM 2019 Problem 1

    Let ABCABC be an acute triangle. Points XX and YY lie on the segments ABAB and ACAC , respectively, such that AX=AYAX=AY and the segment XYXY passes through the orthocenter of the triangle ABCABC . Lines tangent to the circumcircle of the triangle AXYAXY at points XX and YY intersect at point PP . Prove that points A,B,C,PA, B, C, P are concyclic.

    Dataset text AI-MO AoPS. Quoted with source.

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