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RU-SPB 2022 Problem 115

    Altitudes AA1,BB1,CC1AA_1, BB_1, CC_1 of acute triangle ABCABC intersect at point HH . On the tangent drawn from point CC to the circle (AB1C1)(AB_1C_1) , the perpendicular HQHQ is drawn (the point QQ lies inside the triangle ABCABC ). Prove that the circle passing through the point B1B_1 and touching the line ABAB at point AA is also tangent to line A1QA_1Q .

    Dataset text AI-MO AoPS. Quoted with source.

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