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The circuit shown below is driven by a sinusoidal input $\mathrm{v}_{\mathrm{i}}=\mathrm{V}_{\mathrm{P}} \cos (\mathrm{t} / \mathrm{RC})$. The steady state output $v_0$ is

1. $\left(V_p / 3\right) \cos (t / R C)$
2. $\left(V_p / 3\right) \sin (t / R C)$
3. $\left(\mathrm{V}_{\mathrm{p}} / 2\right) \cos (\mathrm{t / RC})$
4. $\left(V_p / 2\right) \sin (t / R C)$