If \( \vec{a} \) and \( \vec{b} \) are unit vectors such that \( \v...
If \( \vec{a} \) and \( \vec{b} \) are unit vectors such that \( \vec{a} \cdot \vec{b}=\cos \theta \),
\( \mathrm{P} \)
W then the value of \( |\vec{a}+\vec{b}| \), is:
(1) \( 2 \sin \theta / 2 \)
(2) \( 2 \sin \theta \)
(3) \( 2 \cos \theta / 2 \)
(4) \( 2 \cos \theta \)
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