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vineri, 24 septembrie 2021

IGO 2014, aops, Morteza Saghafian, https://artofproblemsolving.com/community/c6t48f6h1677987_equal_angles_when_ltc__lta__90o


 

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Mi Prepa, https://www.facebook.com/photo?fbid=1427344626075511&set=a.575642501245732

  Mi Prepa, https://www.facebook.com/photo?fbid=1427344626075511&set=a.575642501245732 In the interior of triangle ABC having ...