The circuit in Figure P8-57 is operating in the sinusoidal steady state.
(a) If \(v_{\mathrm{S}}(t)=1 \cos (2128 t) \mathrm{V}\), find the output \(v_{\mathrm{O}}(t)\).

(b) At what frequency is the magnitude of the output voltage equal to half of the magnitude of the input voltage in the circuit of Figure P8-57? Use Multisim and do an ac sweep from \(1 \mathrm{~Hz}\) to \(100 \mathrm{kHz}\), and then use Grapher View's cursor to find the desired frequency.