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+//Caption:transfer_function

+// example 3.2.7

+//page 39

+// we have defined parallel and series function which we are going to use here

+//exec parallel.sce;

+//exec series.sce;

+syms G1 G2 G3 H1 H2;

+//shift the take off point placed before G2 to after block G2

+a=G2*H1;

+//shift the take off point placed before G2 to after block G1 and shift the summing point before block G2 to before block G2

+//interchange consecutive summing point and shift the take off point placed before H2 to after block H2

+b=G2*H2;

+c=b*H1;

+d=parallel(G3,G2);

+e=1/.b

+f=series(d,e);

+g=G1/.a

+h=series(g,f);

+y=h/(1-h*c);

+y=simple (y);

+disp(y,"C(s)/R(s)=")
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