PL-OM 2019 Problem 6
Denote by the circumcircle of the acute triangle . Point is the midpoint of the arc of not containing . Circle centered at is tangent to the segment at point . Tangents to the circle passing through point intersect line at points and such that points lie on the line in that order. Circle is tangent to the segments and and to the circle at point . Circle is tangent to the segments and and to the circle at point . Lines and intersect at point . Prove that .
Dataset text AI-MO AoPS. Quoted with source.
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