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RU-ALLRUSSIAN 2022 Problem 107

    Point EE is marked on side BCBC of parallelogram ABCDABCD , and on the side ADAD - point FF so that the circumscribed circle of ABEABE is tangent to line segment CFCF . Prove that the circumcircle of triangle CDFCDF is tangent to line AEAE .

    Dataset text AI-MO AoPS. Quoted with source.

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