Question: A unity feedback control system has open loop transfer function a ) Find the range of values of K so that the closed loop system

A unity feedback control system has open loop transfer function
a) Find the range of values of K so that the closed loop system is stable.
b) Find the value of K for which the closed loop system will be marginally stable.
c) Find the frequency of the un-damped oscillation in case of marginal stability.

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