The matrices in the state-space form of a system model are given.

a. Find the transfer function (or transfer matrix) by using Equation 4.21.

b. Verify the result of (a) by using the ss2tf command.

$A=\left[\begin{array}{cc}0& 1\\ -1& -2\end{array}\right],B=\left[\begin{array}{c}0\\ \frac{2}{3}\end{array}\right],C=\left[\begin{array}{cc}0& 1\end{array}\right],D=\frac{1}{3}$