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diff --git a/257/CH7/EX7.39/example_7_39.sce b/257/CH7/EX7.39/example_7_39.sce
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+++ b/257/CH7/EX7.39/example_7_39.sce
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+syms s
+
+G=10/(s^2*(s^2+s+10))
+H=s;
+T=G/(1+G*H)
+
+Kp=limit(s*T/s,s,0) //Kp= position error coefficient
+Kv=limit(s*T,s,0) //Kv= velocity error coefficient
+Ka=limit(s^2*T,s,0) //Ka= accelaration error coefficient
+
+disp(Ka ,"Ka = ")
+disp(Kv ,"Kv = ")
+disp(Kp ,"Kp = ")
+
+R=10/s
+T1=T/(1+T)
+C=R*T1;
+Css=limit(s*C,s,0)
+disp(Css," Css = ") \ No newline at end of file