Question
Let \( \vec{a}, \vec{b} \) and \( \vec{c} \) be three-unit vectors such that
\( \vec{a}.... VIDEO
Question
Let \( \vec{a}, \vec{b} \) and \( \vec{c} \) be three-unit vectors such that
\( \mathrm{P} \)
\( \vec{a} \times(\vec{b} \times \vec{c})=\frac{\sqrt{3}}{2}(\vec{b}+\vec{c}) \). If \( \vec{b} \) is not parallel to \( \vec{c} \), then the angle between \( \vec{a} \) and \( \vec{b} \) is
(1) \( \frac{3 \pi}{4} \)
(2) \( \frac{\pi}{2} \)
(3) \( \frac{2 \pi}{3} \)
(4) \( \frac{5 \pi}{\dot{6}} \)
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