Difference between revisions of "2018 JBMO Problems"
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Revision as of 03:11, 1 August 2019
Problems/Problem 4
Let 
and 
,
,
the symmetrics of vertex over opposite sides.The intersection of the circumcircles of 
and 
is 
.
and 
are defined similarly.Prove that lines 
,
and 
are concurent.
