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SHARYGIN 2016 Problem 12

    Let BB1BB_1 be the symmedian of a nonisosceles acute-angled triangle ABCABC . Ray BB1BB_1 meets the circumcircle of ABCABC for the second time at point LL . Let AHA,BHB,CHCAH_A, BH_B, CH_C be the altitudes of triangle ABCABC . Ray BHBBH_B meets the circumcircle of ABCABC for the second time at point TT . Prove that HA,HC,T,LH_A, H_C, T, L are concyclic.

    Dataset text AI-MO AoPS. Quoted with source.

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