Question
If unit vectors $\vec{a}$ and $\vec{b}$ are inclined at an angle $2\theta$ such that $\left|\vec{a} - \vec{b}\right| < 1$ and $0 \leq \theta \leq \pi$, then $\theta$ lies in the interval:
If unit vectors $\vec{a}$ and $\vec{b}$ are inclined at an angle $2\theta$ such that $\left|\vec{a} - \vec{b}\right| < 1$ and $0 \leq \theta \leq \pi$, then $\theta$ lies in the interval: