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BALKAN-SL 2008 G6

    On triangle ABCABC the AMAM ( M∈BCM\in BC ) is median and BB1BB_1 and CC1CC_1 ( B1∈AC,C1∈ABB_1 \in AC,C_1 \in AB ) are altitudes. The stright line dd is perpendicular to AMAM at the point AA and intersect the lines BB1BB_1 and CC1CC_1 at the points EE and FF respectively. Let denoted with ω\omega the circle passing through the points E,ME, M and FF and with ω1\omega_1 and with ω2\omega_2 the circles that are tangent to segment EFEF and with ω\omega at the arc EFEF which is not contain the point MM . If the points PP and QQ are intersections points for ω1\omega_1 and ω2\omega_2 then prove that the points P,QP, Q and MM are collinear.

    Dataset text AI-MO AoPS. Quoted with source.

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