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If $V_{i}=V_{1} \sin (\omega t)$ and $V_{o}=V_{2} \sin (\omega t+\phi)$, then the minimum and maximum values of $\phi$ (in radians) are respectively
1. $-\pi / 2$ and $\pi / 2$
2. $0$ and $\pi / 2$
3. $-\pi$ and $0$
4. $-\pi / 2$ and $0$