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luni, 23 august 2021

Aops, Armenia 2014, https://artofproblemsolving.com/community/c6t48f6h2650078_ab__ad_if_ltcab__72o_ltcad_ltbdc_36o_ltdbc_18o


 

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https://artofproblemsolving.com/community/c6h616123p3670325

 This is my synthetic proof to the subject problem: