NL-BXMO-TST 2011 Problem 2
In an acute triangle the angle is greater than . Let be such that is a diameter of the circumscribed circle of \vartriangle ABC. Let be the intersection of and the tangent line at to . Let be the orthogonal projection of on and let be the intersection of and . Prove that is the bisector of .
Dataset text AI-MO AoPS. Quoted with source.
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