1) Calculer $$\Vert \vec{u} \land \vec{v} \Vert \text{ sachant que } \Vert\vec{u} \Vert = \Vert\vec{v} \Vert = 6 \text{ et } (\bar{\vec{u},\vec{v}}) = \frac{\pi}{6} [2\pi] $$