Let \( \vec{a}, \vec{b} \) and \( \vec{c} \) three vectors having m...
Let \( \vec{a}, \vec{b} \) and \( \vec{c} \) three vectors having magnitudes 1,1
\( \mathrm{P} \)
W and 2 respectively. If \( \vec{a} \times(\vec{a} \times \overrightarrow{\mathrm{c}})+\vec{b}=\overrightarrow{0} \), the acute angle between \( \vec{a} \) and \( \vec{c} \) is
(1) \( \frac{\pi}{6} \)
(2) \( \frac{\pi}{3} \)
(3) \( \frac{\pi}{4} \)
(4) \( \frac{2 \pi}{3} \)
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