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+s=%s;
+H=syslin('c',1/((s+4)*(s+2)))
+nyquist(H)
+show_margins(H,'nyquist')
+printf("Since P=1 and the pt. -1+j0 is encircled once by the locus")
+printf("Hence N=1 therefore, Z=0(no of zeros in RHP)")
+printf("System is stable")
+gm=g_margin(H) // gain margin
+pm=p_margin(H) // phase margin