My question is:
If I have a transfer function $(G(s)=\frac{2}{(s+1)^2})$ like the one in picture , and I want to determinate the lower value on the real axis of the function in the nyquist diagram, in order to apply the circle criterion, how can I do?
with the matlab plot I found that this point is near the value $\frac{-1}{4}$ but how can I found this value in an analitical way?
2026-03-31 15:12:39.1774969959
how can apply the circle criterion?
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