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+s=%s;
+syms k
+H=syslin('c',2/(s*(1-2*s)))
+// for K/2>-1 or K>-2
+nyquist(H)
+show_margins(H,'nyquist')
+printf("P=1(poles in RHP)")
+printf("N=0,hence Z=1")
+printf("Therefore,System is unstable")