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IT-CESENATICO 2021 Problem 2

    Let ABCABC a triangle and let II be the center of its inscribed circle. Let DD be the symmetric point of II with respect to ABAB and EE be the symmetric point of II with respect to ACAC . Show that the circumcircles of the triangles BIDBID and CIECIE are eachother tangent.

    Dataset text AI-MO AoPS. Quoted with source.

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