BALKAN-SL 2008 G6
On triangle the ( ) is median and and ( ) are altitudes. The stright line is perpendicular to at the point and intersect the lines and at the points and respectively. Let denoted with the circle passing through the points and and with and with the circles that are tangent to segment and with at the arc which is not contain the point . If the points and are intersections points for and then prove that the points and are collinear.
Dataset text AI-MO AoPS. Quoted with source.
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