CZ-SK-MO 2023 Problem 3
In acute triangle let be its orthocenter and be its incenter. Let be the projection of point onto the line and be the reflection of point in point . Further, let be the projection of point onto the line . Prove that points and lie on circle.
Dataset text AI-MO AoPS. Quoted with source.
Official text: Czech-Slovak Mathematical Olympiad 2023 official paper, page 1.
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