The open-loop transfer function of a feedback control system is [ mathrm{G}(s) mathrm{H}(s)=frac{1}{(s+1)^{3}} ] The gain margin
Question:
The open-loop transfer function of a feedback control system is
\[
\mathrm{G}(s) \mathrm{H}(s)=\frac{1}{(s+1)^{3}}
\]
The gain margin of the system is
(a) 2
(b) 4
(c) 8
(d) 16
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