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diff --git a/104/CH7/EX7.2/7_2.sce b/104/CH7/EX7.2/7_2.sce
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+//steady state errors from open loop transfer function
+s=%s;
+//type 1 system
+G=syslin('c',(s+3.15)/(s*(s+1.5)*(s+0.5)))//K=1
+disp(G,"G(s)=")
+H=1;
+y=G*H;
+disp(y,"G(s)H(s)=")
+syms s;
+Kv=limit(s*y,s,0); //Kv= velocity error coefficient
+Ess=1/Kv
+//Refering the table 7.1 given in the book ,For type 1 system  Kp=%inf,Ess=0 & Ka=0,Ess=%inf
+printf("For type1 system \n step input Kp=inf Ess=0 \n \n parabolic input Ka=0 Ess=inf \n ")
+disp(Kv,"ramp input Kv=")
+disp(Ess,"Ess=")
+//type 2 system
+p=poly([1],'s','coeff');
+q=poly([0 0 12 1],'s','coeff');
+G=p/q;//K=1
+disp(G,"G(s)=")
+H=1;
+y=G*H;
+disp(y,"G(s)H(s)=")
+Ka=limit(s^2*y,s,0); //Ka= parabolic error coefficient
+Ess=1/Ka
+//Refering the table 7.1 given in the book ,For type 2 system  Kp=%inf,Ess=0 & Kv=inf,Ess=0
+printf("For type2 system \n step input Kp=inf Ess=0 \n ramp input Kv=inf Ess=0 \n ")
+disp(Ka,"parabolic input Ka=")
+disp(Ess,"Ess=")
+//type 2 system
+p=poly([5 5],'s','coeff');
+q=poly([0 0 60 17 1],'s','coeff');
+G=p/q;//K=1
+disp(G,"G(s)=")
+H=1;
+y=G*H;
+disp(y,"G(s)H(s)=")
+Ka=limit(s^2*y,s,0); //Ka= parabolic error coefficient
+Ess=1/Ka
+//Refering the table 7.1 given in the book ,For type 2 system  Kp=%inf,Ess=0 & Kv=inf,Ess=0
+printf("For type2 system \n step input Kp=inf Ess=0 \n ramp input Kv=inf Ess=0 \n ")
+disp(Ka,"parabolic input Ka=")
+disp(Ess,"Ess=")