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OSN 2022 Problem 6

    In a triangle ABCABC , DD and EE lies on ABAB and ACAC such that DEDE is parallel to BCBC . There exists point PP in the interior of BDECBDEC such that ∠BPD=∠CPE=90∘\angle BPD = \angle CPE = 90^{\circ}Prove that the line APAP passes through the circumcenter of triangles EPDEPD and BPCBPC .

    Dataset text AI-MO AoPS. Quoted with source.

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