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vineri, 3 septembrie 2021

2012 Cono Sur, Brasil Test

 This solution has been given by my son to one of his class mates when a IMO test was given back in 2001-2002, although at that time only AN bisector of <BNC might have been requested.


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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 ...