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Tifoox
@Tifoox
May 2019
1
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Bonjour, DM de maths :
1) Montrer que pour tout réel x tel que sin x ≠ 0, cosxcos(2x)cos(4x )=
2) En déduire la valeur exacte du produit cos π/7 cos 2π/7 cos 4π/7
Je n'y arrive pas, merci de votre aide !
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Franice
Bonjour si tu ne vois pas bien les photos fais moi signe
1 votes
Thanks 1
Tifoox
Je les vois bien. Merci beaucoup !
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Bonjour, DM de maths a rendre pour la semaine pro, je bloque sur la question 1 de l'exercice 2, merci !
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