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duminică, 6 martie 2022

aops, Japan JMO, 2019, finals 1, https://artofproblemsolving.com/community/c6t48f6h1783289_2019_japan_junior_mathematical_olympiad_finals_1


 

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https://artofproblemsolving.com/community/c6h616123p3670325

 This is my synthetic proof to the subject problem: