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Screenshot (69).pngScreenshot (70).pngScreenshot (68).png1. The open loop transfer function of a unity feedback system is given by \(\frac{K}{(S+2)(S+4)\left(S^{2}+6 S+25\right)}\).By applying routh criterion, discuss the stability of the closed loop system as a function of \(\mathrm{K}\) which will cause sustained oscillations in the closed-loop system. What are corresponding oscillation frequencies.