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marți, 28 decembrie 2021

aops, https://artofproblemsolving.com/community/c6t48f6h2745721_ab__mnmn_if_ac__m_ad__n_in_regular_heptagon_abcdefg


 

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https://artofproblemsolving.com/community/c6h616123p3670325

 This is my synthetic proof to the subject problem: