The angle between vectors $\vec a$ and $\vec b$ is $\frac{\pi }{6}$. The angle between vectors $ - 3\vec a$ and $ 2\vec b$ is
The angle between vectors $\vec a$ and $\vec b$ is $\frac{\pi }{6}$. The angle between vectors $ - 3\vec a$ and $ 2\vec b$ is
- A
$\frac{\pi }{3}$
- B
$\frac{\pi }{2}$
- C
$\frac{7\pi }{6}$
- D
$\frac{5\pi }{6}$
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