ONLY USE MATLAB TO ANSWER QUESTION. PLEASE PROVIDE ALL MATLAB CODE. AND THE OUTPUT OF THE CODE: CP$4\mathrm{.}2$ Consider the transfer function $($without feedback$)$

$G(s)=\frac{4}{s^2+2s+20}.$

When the input is a unit step, the desired steady$-$state

value of the output is one. Using the step function, show

that the steady$-$state error to a unit step input is $0\mathrm{.}8.$