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EGMO 2024 Problem 2

  • Day 1

Let ABCABC be a triangle with AC>ABAC > AB, and denote its circumcircle by Ω\Omega and incentre by II. Let its incircle meet sides BC,CA,ABBC, CA, AB at D,E,FD, E, F respectively. Let XX and YY be two points on minor arcs DF^\widehat{DF} and DE^\widehat{DE} of the incircle, respectively, such that ∠BXD=∠DYC\angle BXD = \angle DYC. Let line XYXY meet line BCBC at KK. Let TT be the point on Ω\Omega such that KTKT is tangent to Ω\Omega and TT is on the same side of line BCBC as AA. Prove that lines TDTD and AIAI meet on Ω\Omega.

Official text European Girls' Mathematical Olympiad 2024 official paper, page 1. Quoted with source.

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