$6-$e$^(-$t$)$cos$($t$)$ and e$^(-$t$)$sin$($t$).$ Make the estimation error die out with like e$^(-3$t$)$

and e$^(-4$t$).$ Find K and L for

x$^()=[[2,1,1]]$

$0$x$+[[1]]$

$1$U

Y$=[[1,0]]$x