3. Consider the transfer function below. 50 L(S) = 93 + 4.2 + 6s + 4 = (a) How many unstable poles does the open-loop sy
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3. Consider the transfer function below. 50 L(S) = 93 + 4.2 + 6s + 4 = (a) How many unstable poles does the open-loop sy
3. Consider the transfer function below. 50 L(S) = 93 + 4.2 + 6s + 4 = (a) How many unstable poles does the open-loop system have? (b) How many times does the Nyquist plot encircle-1? (Use MATLAB to plot) (c) What does this say about the stability of the closed-loop system G = L/(1+L)?
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