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Question 1
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If $\vec A+\vec B+\vec C=\vec0$, $|\vec A|=3$, $|\vec B|=5$, $|\vec C|=7$, then the angle between $\vec A$ and $\vec B$ is
A.
$\dfrac{\pi}{6}$
B.
$\dfrac{\pi}{3}$
C.
$\dfrac{2\pi}{3}$
D.
$\dfrac{\pi}{4}$
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