Question: A unity feedback system with the open loop transfer function (mathrm{G}(s)=frac{1}{s(s+2)(s+4)}) has gain margin of (a) (33.6 mathrm{~dB}) (b) (32.4 mathrm{~dB}) (c) (32.6 mathrm{~dB}) (d)

A unity feedback system with the open loop transfer function $\mathrm{G}(s)=\frac{1}{s(s+2)(s+4)}$ has gain margin of
(a) $33.6 \mathrm{~dB}$
(b) $32.4 \mathrm{~dB}$
(c) $32.6 \mathrm{~dB}$
(d) $30.6 \mathrm{~dB}$

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