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Czech-Polish-Slovak Match problem

Difficulty 3

Problem

Let ABCABC be an acute scalene triangle. Let DD and EE be points on the sides ABAB and ACAC, respectively, such that BD=CEBD = CE. Denote by O1O_1 and O2O_2 the circumcentres of the triangles ABEABE and ACDACD, respectively. Prove that the circumcircles of the triangles ABCABC, ADEADE and AO1O2AO_1O_2 have a common point different from AA.


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