If $|\vec{a} - \vec{b}| = |\vec{a}| = |\vec{b}| = 1$, then the angle between $\vec{a}$ and $\vec{b}$ is:

Question

$\frac{\pi}{3}$

$\frac{3\pi}{4}$

$\frac{\pi}{2}$

$0$

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