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KöMaL 2025 B5484

    Let MM denote the orthocenter of acute triangle ABCABC, and let FF denote the midpoint of side BCBC. Let TT denote the foot of the perpendicular from MM to the inner angle bisector at vertex AA. Line FTFT intersects side ACAC at point DD. Prove that the circumcircle of triangle CDFCDF contains the foot of the height of triangle ABCABC from vertex AA.

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