This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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||\vec{u}||y = ||\vec{v}||$. Les équations sont:
Voici la solution détaillée pour chaque partie du problème.
1. Calculer et .
Step 1: Écrire le système d'équations donné. Soit et . Les équations sont:
Step 2: Substituer l'équation (1) dans l'équation (2). Développer le carré:
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Voici la solution détaillée pour chaque partie du problème. 1.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.