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TR-MO 2022 Problem 5

    In triangle ABCABC , 90o>∠A>∠B>∠C90^{o}> \angle A> \angle B> \angle C . Let the circumcenter and orthocenter of the triangle be OO and HH . OHOH intersects BCBC at TT and the circumcenter of (AHO)(AHO) is XX . Prove that the reflection of HH over XTXT lies on the circumcircle of triangle ABCABC .

    Dataset text AI-MO AoPS. Quoted with source.

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