If $\vec{a}$ and $\vec{b}$ are unit vectors and $\theta$ is the angle between $\vec{a}$ and $\vec{b}$, then $\sin \frac{\theta}{2}$ is:

Question

$\frac{|\vec{a} - \vec{b}|}{|\vec{a} - \vec{b}|}$

$\frac{|\vec{a} - \vec{b}|}{|\vec{a} + \vec{b}|}$

$\frac{2}{|\vec{a} + \vec{b}|}$

$\frac{|\vec{a} - \vec{b}|}{2} $

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