Geometria, altfel - probleme pentru concursuri
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luni, 22 noiembrie 2021
aops, Cono Sur 2017 Training List, https://artofproblemsolving.com/community/c6t48f6h2723266_ltadb__lt_cam_if_ltdab__90o_ltadc_ltbam
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https://artofproblemsolving.com/community/c6h616123p3670325
This is my synthetic proof to the subject problem:
ToT2, pr. 1, 2
Own problem
Own maybe...
IGO 2014, aops, Morteza Saghafian, https://artofproblemsolving.com/community/c6t48f6h1677987_equal_angles_when_ltc__lta__90o
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