Report - Planche no 12. Trigonométrie circulaire : corrigé · De même, sin2 π 8 = 1 2 1 −cos 2 × π 8 = 2 − √ 2 4 et donc, puisque sin π 8 > 0, sin π 8 = p 2 − √ 2 2. Exercice

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