IMO Shortlist 2005 problem G6
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Avg: 8,0 Let be a triangle, and the midpoint of its side . Let be the incircle of triangle . The median of triangle intersects the incircle at two points and . Let the lines passing through and , parallel to , intersect the incircle again in two points and . Let the lines and intersect again at the points and . Prove that .
Izvor: Međunarodna matematička olimpijada, shortlist 2005