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Soient deux vecteurs  \vec{u}    et   \vec{v}   tels que  ||\vec{u}||=2   ...

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Soient deux vecteurs  \vec{u}\vec{u}   et   \vec{v}\vec{v}  tels que  ||\vec{u}||=2||\vec{u}||=2  ,  ||\vec{v}||=3||\vec{v}||=3   et   \vec{u}\cdot \vec{v}=-2\vec{u}\cdot \vec{v}=-2 .

Que vaut la norme du vecteur   \vec{v}-2\vec{u}\vec{v}-2\vec{u}  ?

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