申論題

3.(26%) With r(t) as the input and y() as the output, this problem considers a linear system that can be represented by  where R(s) and Y(s) are the Laplace transforms of r(V) and y(t), respectively. With r(t) = cos21, it is known that the steady-state response of this system can be represented as Acos(at - π). Based on such information, please determine A, d, and T.