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Author(s) Philippe Delsarte, Manon Oreins
Deadline No deadline
Submission limit No limitation
Category tags Trigo

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Trigonométrie - Q14

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Calculer la somme \(S = \cos^4 \frac{\pi}{8} + \cos^4 \frac{3\pi}{8} + \cos^4 \frac{5 \pi}{8} + \cos^4 \frac{7\pi}{8}\).