Question: The open-loop transfer function of a control system is given as follow: 00 3 8 (1+2s)(2+s+s) a) Obtain the expression of amplitude ratio A.R.

The open-loop transfer function of a control system is given as follow: 00 3 8 (1+2s)(2+s+s) a) Obtain the expression of amplitude ratio A.R. b) Obtain the expression of phase angle c) Sketch the polar plot d) Evaluate the system stability

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