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Nombres complexes bt1 - Math93 · EXERCICE 2. Soit ϕ réel ; z = cos 2 ϕ + i sin ϕ cos ϕ. 1° Déterminer ϕ tel que z = 0. 2° Si z ≠ 0, calculer z−1, z2, z−2, z3, z−3.
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