If \( \theta \) is the angle between two vectors \( \vec{a} \) and \( \vec{b} \), then \( \vec{a...
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0If \( \theta \) is the angle between two vectors \( \vec{a} \) and \( \vec{b} \), then \( \vec{a} \cdot \vec{b} \geq 0 \) only when
(A) \( 0\theta\frac{\pi}{2} \)
(B) \( 0 \leq \theta \leq \frac{\pi}{2} \)
(C) \( \mathrm{O}\boldsymbol{\theta}\pi \)
(D) \( \mathrm{O} \leq \theta \leq \pi \)
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