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diff --git a/257/CH7/EX7.37/example_7_37.sce b/257/CH7/EX7.37/example_7_37.sce
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+syms s
+
+T1=12/((s+3)*(s+4));
+T2=-3/(s+4);
+
+L1=-24/((s+3)*(s+4)*(s+5));
+
+delta=1-(L1)
+del1=1;
+del2=1;
+
+T=(T1*del1 + T2*del2)/delta ;
+disp(T,"T = ")
+
+G=T/(1-T)
+disp(G," G=")
+H=1
+
+Kp=limit(s*G*H/s,s,0) //Kp= position error coefficient
+Kv=limit(s*G*H,s,0) //Kv= velocity error coefficient
+disp(Kv ,"Kv = ")
+disp(Kp ,"Kp = ")
+
+Ess=1/(1+Kp)
+disp(Ess, "Ess for step input is = ")
+disp(" for ramp input e=infinity")
+
+
+
+
+
+