BALKAN-SL 2021 G6
Let be an acute triangle such that . Let be the circumcircle of and assume that the tangent to at intersects the line at . Let be the circle with center and radius . Denote by the second intersection point of and . Let be the midpoint of . If the line meets again at , and the line meets for the second time at , show that and are collinear.
Dataset text NuminaMath olympiads. Quoted with source.
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