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c1233
@c1233
March 2021
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Bonjour, j’ai besoin d’aide pour cet exercice
Dans un orthonormé (O;I;J),
on considère le cercle trigonométrique et le point M
associé au réel pi/4
a. Déterminer les coordonnées de M dans le repère
(O;I;J)
b. Calculer IM.
c. En déduire la valeur exacte de sin(pi/8) puis celle de
cos(pi/8)
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