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SHARYGIN 2016 Problem 17

    Let DD be an arbitrary point on side BCBC of triangle ABCABC . Circles ω1\omega_1 and ω2\omega_2 pass through AA and DD in such a way that BABA touches ω1\omega_1 and CACA touches ω2\omega_2 . Let BXBX be the second tangent from BB to ω1\omega_1 , and CYCY be the second tangent from CC to ω2\omega_2 . Prove that the circumcircle of triangle XDYXDY touches BCBC .

    Dataset text AI-MO AoPS. Quoted with source.

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