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KöMaL 2024 C1807

    In triangle ABCABC angles satisfy 2β=3γ2\beta = 3\gamma. Let points DD and EE be chosen on side ACAC such that BDBD and BEBE trisect angle β\beta, and point DD is located between points AA and EE. Further, let FF denote the intersection of side ABAB and the angle bisector of γ\gamma. Prove that BEBE and DFDF are parallel.

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