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BG-MO 2021 Problem 2

    A point TT is given on the altitude through point CC in the acute triangle ABCABC with circumcenter OO , such that ∡TBA=∡ACB\measuredangle TBA=\measuredangle ACB . If the line COCO intersects side ABAB at point KK , prove that the perpendicular bisector of ABAB , the altitude through AA and the segment KTKT are concurrent.

    Dataset text AI-MO AoPS. Quoted with source.

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