Question: The forward path transfer function of a unity feedback system is given by (mathrm{G}(s)=frac{1}{(1+s)^{2}}). What is the phase margin for this system? (a) (-pi operatorname{rad})

The forward path transfer function of a unity feedback system is given by \(\mathrm{G}(s)=\frac{1}{(1+s)^{2}}\). What is the phase margin for this system?
(a) \(-\pi \operatorname{rad}\)
(b) \(0 \mathrm{rad}\)
(c) \(\pi / 2 \mathrm{rad}\)
(d) \(\pi \mathrm{rad}\)

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