olymmath

OMCPLP 2016 Problem 2

  • Day 1

The circle ω1\omega_1 intersects the circle ω2\omega_2 in the points AA and BB , a tangent line to this circles intersects ω1\omega_1 and ω2\omega_2 in the points EE and FF respectively. Suppose that AA is inside of the triangle BEFBEF , let HH be the orthocenter of BEFBEF and MM is the midpoint of BHBH . Prove that the centers of the circles ω1\omega_1 and ω2\omega_2 and the point MM are collinears.

Dataset text AI-MO AoPS. Quoted with source.

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