OBM 2019 Problem 1
Sejam e duas circunferências de centros e , respectivamente, que se cortam em dois pontos e . Suponha que a circunferência circunscrita ao triângulo intersecte novamente em e novamente em . Suponha ainda que está no interior do triângulo . Demonstre que é o incentro do triângulo .
Official text Brazilian Mathematical Olympiad 2019 official paper, page 1. Quoted with source.
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