KMO 2021 Problem 6
Let be an obtuse triangle with , and let be a midpoint of the side . Let be a point on the arc of the circumcircle of triangle not containing . Suppose that the circle tangent to at and passing through meets the circumcircle of triangle again at and . , the circumcircle of triangle , meets again at .
Prove that lines and meet on the line tangent to at .
Dataset text AI-MO AoPS. Quoted with source.
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