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OBM 2019 Problem 1

    Sejam ω1\omega_1 e ω2\omega_2 duas circunferências de centros C1C_1 e C2C_2, respectivamente, que se cortam em dois pontos PP e QQ. Suponha que a circunferência circunscrita ao triângulo PC1C2PC_1C_2 intersecte ω1\omega_1 novamente em A≠PA \neq P e ω2\omega_2 novamente em B≠PB \neq P. Suponha ainda que QQ está no interior do triângulo PABPAB. Demonstre que QQ é o incentro do triângulo PABPAB.

    Official text Brazilian Mathematical Olympiad 2019 official paper, page 1. Quoted with source.

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