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OMM 2019 Problem 6

    Let ABCABC be a triangle such that ∠BAC=45∘\angle BAC = 45^{\circ} . Let H,OH,O be the orthocenter and circumcenter of ABCABC , respectively. Let ω\omega be the circumcircle of ABCABC and PP the point on ω\omega such that the circumcircle of PBHPBH is tangent to BCBC . Let XX and YY be the circumcenters of PHBPHB and PHCPHC respectively. Let O1,O2O_1,O_2 be the circumcenters of PXOPXO and PYOPYO respectively. Prove that O1O_1 and O2O_2 lie on ABAB and ACAC , respectively.

    Dataset text AI-MO AoPS. Quoted with source.

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