The forward path transfer function of a unity feedback system is given by (mathrm{G}(s)=frac{1}{(1+s)^{2}}). What is the

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) $-\pi \operatorname{rad}$
(b) $0 \mathrm{rad}$
(c) $\pi / 2 \mathrm{rad}$
(d) $\pi \mathrm{rad}$

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