Question: The characteristic equation of a closed loop system is given by c ( S ) = s ^ 4 + 4 s ^ 3 +

The characteristic equation of a closed loop system is given by
c (S)= s^4+4s^3+6s^2+4S +(I + Kc)
10% a) Find the range of values of the gain Kc for which the closed loop is stable
10% b) Determine the values of Kc for which the closed loop is at the limit of stability

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