CZ-SK-MO 2025 Problem 6
Let be an acute triangle, its orthocenter, circumcenter and midpoint of Denote the intersection of line and the circumcircle intersection of line and Finally, let be the intersection of line and the circumcircle of Show that
Dataset text AI-MO AoPS. Quoted with source.
Official text: Czech-Slovak Mathematical Olympiad 2025 official paper, page 1.
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