$11$ Design cascade controller using frequency response technique for the system $10$ given below:

$G_{CS}=K_{CS},G_{PS}=\frac{2e^{-0\mathrm{.}5s}}{s+1},G_{CP}=K_{CP}(1+\frac{1}{{}_{l}s}),G_{PP}=\frac{2\mathrm{.}5e^{-1\mathrm{.}2s}}{4s+1}$

Neglect the dynamics of all other elements. The terms are having their usual meaning