The step response of a linear circuit is \(g(t)\) \(=\left[1-10ight.\) te \(\left.e^{-10 t}ight] u(t)\). The sinusoidal steady-state response is noted to be \(y_{\mathrm{SS}}(t)=18.03 \cos \left(20 t+19.4^{\circ}ight)\). What was the input that caused that output?