MEMO 2015 ekipno problem 6
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Avg: 6,0Let be the incentre of triangle with and let the line intersect the side at . Suppose that point lies on the segment and satisfies . Further, let be the point obtained by reflecting over the perpendicular bisector of , and let be the other intersection of the circumcircles of the triangles and . Prove that .
Izvor: Srednjoeuropska matematička olimpijada 2015, ekipno natjecanje, problem 6