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+//Caption:time_response_for_step_function
+//example 6.10.1
+//page 170
+// we have defined parallel and series function which we are going to use here
+exec parallel.sce;
+exec series.sce;
+s=%s;
+syms t;
+a=4/(s*(s+4))
+b=s+1.2
+c=s+0.8
+d=a/(1+a)
+e=parallel(b,c)
+f=d/.e;
+disp(f,"C(s)/R(s)=");//transfer function
+//since input:r(t)=2, so R(s)=2/s;//step_function_of_magnitude_2
+g=f*(2/s);
+disp(g,"C(s)=");
+[A]=pfss(8/(s*(s+2)*(s+6)))
+F=ilaplace((8/(s*(s+2)*(s+6))),s,t);
+disp(F,"time_response_for_step_function_of_magnitude_2,f(t)=")
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