Produit scalaire et cosinus

On note θ une mesure de l'angle (u→,v→) en radians.
Déterminer la valeur exacte du produit scalaire u→⋅v→ lorsque:
∥u→∥=, ∥v→∥= et θ=−π3
.

Aide à la saisie

Pour saisir une racine carrée, taper sqrt(..), ex pour 22, taper sqrt(2)/2.


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