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BALTIC-WAY 2020 Problem 12

    Let ABCA B C be a triangle with circumcircle ω\omega. The internal angle bisectors of ∠ABC\angle A B C and ∠ACB\angle A C B intersect ω\omega at X≠BX \neq B and Y≠CY \neq C, respectively. Let KK be a point on CXC X such that ∠KAC=90∘\angle K A C=90^{\circ}. Similarly, let LL be a point on BYB Y such that ∠LAB=90∘\angle L A B=90^{\circ}. Let SS be the midpoint of arc⁡CAB\operatorname{arc} C A B of ω\omega. Prove that SK=SLS K=S L.

    Dataset text NuminaMath olympiads. Quoted with source.

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