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If the $\text{op-amp}$ in figure is ideal, then $v_{0}$ is

1. zero
2. $\left(\mathrm{V}_{1}-\mathrm{V}_{2}\right) \sin \omega t$
3. $-\left(V_{1}+V_{2}\right) \sin \omega t$
4. $\left(\mathrm{V}_{1}+\mathrm{V}_{2}\right) \sin \omega t$