Question: For the control system with open - loop transfer function , ( ) = 1 / ( ( + 1 ) ) ( a )

For the control system with open-loop transfer function ,()=1/((+1))
(a) Sketch the Nyquist plot for the open-loop transfer function when changes from()
to ; +
(b) Determine the closed-loop system stability by the Nyquist criterion.

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