Bonjour, j’ai un dm et je n’arrive pas à faire cet exercice de 1ere Déterminer une mesure de l'angle géométrique AOB lorsque
1. ||OẢ|| = 5, ||OB|| = 6 et OÀ.OB = 15.
2. ||OA|| = 3, ||OB|| = 2 et OÀ.OB = -3racine carré3

Merciii
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