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IR-TST 2007 Problem 6

  • Day 2

Let ω\omega be incircle of ABCABC . PP and QQ are on ABAB and ACAC , such that PQPQ is parallel to BCBC and is tangent to ω\omega . AB,ACAB,AC touch ω\omega at F,EF,E . Prove that if MM is midpoint of PQPQ , and TT is intersection point of EFEF and BCBC , then TMTM is tangent to ω\omega . By Ali Khezeli

Dataset text AI-MO AoPS. Quoted with source.

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