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Parmi les angles \alpha ci-dessous, lequel a un cosinus positif et un sinus...

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Parmi les angles $\alpha$ \alpha ci-dessous, lequel a un cosinus positif et un sinus négatif.

$\alpha= \frac{32\pi}{7}$ \alpha= \frac{32\pi}{7}

$\alpha= \frac{40\pi}{7}$ \alpha= \frac{40\pi}{7}

$\alpha= \frac{36\pi}{7}$ \alpha= \frac{36\pi}{7}

Aucun des angles proposés ne satisfait l'énoncé .

$\alpha= \frac{44\pi}{7}$ \alpha= \frac{44\pi}{7}

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