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s=%s;
H=syslin('c',40/((s+4)*(s^2+2*s+1)))
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
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