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Instructions.
Instructions pour la figure interactive: Il est possible de déplacer l’extrémité des vecteurs
\(\vec{u},\vec{v}\) en déplaçant les points
\(A',D'\text{.}\) Regarder ce qui se passe pour l’orientation des quatre points
\(A',B',C',D'\) lorsque l’orientation relative de
\(\vec{u}\) par rapport à
\(\vec{v}\) change.
