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PL-OM 2023 Problem 2

    Given an acute triangle ABCABC with their incenter II . Point XX lies on BCBC on the same side as BB wrt AIAI . Point YY lies on the shorter arc ABAB of the circumcircle ABCABC . It is given that ∠AIX=∠XYA=120∘.\angle AIX = \angle XYA = 120^\circ. Prove that YIYI is the angle bisector of XYAXYA .

    Dataset text AI-MO AoPS. Quoted with source.

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