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//effect of addition of zeroes
s=%s;
sys1=syslin('c',1/(s*(s+1)*(2*s+1)))//taking T1=1,T2=2
nyquist(sys1)
show_margins(sys1,'nyquist')
sys2=syslin('c',(3*s+1)/(s*(s+1)*(2*s+1)))//Td=3
//nyquist(sys2)
//show_margins(sys2,'nyquist')
printf("these two plots show that addition of poles increases stability")
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