Greene Frank
02/08/2024 · Elementary School

Dans le plan complexe rapporté au repère orthonormal \( (0, \vec{u}, \vec{V}) \), soit \( A \) et \( B \) les points d'affixes respectives \( Z_{A}=\frac{1-i \sqrt{3}}{2} \) et \( Z_{B}=\frac{1+i \sqrt{3}}{2} \) a) Donner l'écriture exponentielle de \( Z_{A} \) et \( Z_{B} \) b) Placer les points \( A \) et \( B \) 2- soit \( C \) et \( D \) les points d'affixes respectives \( Z_{C}=1+\frac{\sqrt{3}}{2}+\frac{1}{2} i \) et \( Z_{D}=\frac{3}{2}-\frac{\sqrt{3}}{2} i \) a) Calculer \( / Z_{A}-Z_{C} /, / Z_{A}-Z_{D} / \) et \( / Z_{C}-Z_{D} / \) b) Donner l'interprétation géométrique de chaque module calculé. c) En déduire la nature du triangle \( A C D \)

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a) L'écriture exponentielle de \( Z_{A} \) est \( \cos\left(\frac{5\pi}{3}\right) + i\sin\left(\frac{5\pi}{3}\right) \) et de \( Z_{B} \) est \( \cos\left(\frac{\pi}{3}\right) + i\sin\left(\frac{\pi}{3}\right) \). b) Calculer les différences \( Z_{A} - Z_{C} \), \( Z_{A} - Z_{D} \) et \( Z_{C} - Z_{D} \) et donner leur interprétation géométrique. c) Déduire la nature du triangle \( ACD \) en fonction des modules calculés.

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