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PAGMO 2022 Problem 4

    Let ABCABC be a triangle, with AB≠ACAB\neq AC . Let O1O_1 and O2O_2 denote the centers of circles ω1\omega_1 and ω2\omega_2 with diameters ABAB and BCBC , respectively. A point PP on segment BCBC is chosen such that APAP intersects ω1\omega_1 in point QQ , with Q≠AQ\neq A . Prove that O1O_1 , O2O_2 , and QQ are collinear if and only if APAP is the angle bisector of ∠BAC\angle BAC .

    Dataset text AI-MO AoPS. Quoted with source.

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