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HMMT 2024 T8

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Let PP be a point in the interior of quadrilateral ABCDA B C D such that the circumcircles of triangles PDA,PABP D A, P A B, and PBCP B C are pairwise distinct but congruent. Let the lines ADA D and BCB C meet at XX. If OO is the circumcenter of triangle XCDX C D, prove that OP⊥ABO P \perp A B.

Dataset text NuminaMath olympiads. Quoted with source.

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