Consider the system shown in Figure P9.27. Determine the maximum value of K = Kmax, for which the closed-loop system is stable. Plot the phase margin as a function of the gain 1 ≤ K ≤ Kmax. Explain what happens to the phase margin as K approaches Kmax.
![](https://test.transtutors.com/qimg/c0547123-27f9-4e15-bf37-b55e30cb27e9.png)