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+//Caption:transfer_function

+// example 3.2.11

+//page 45

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

+//exec parallel.sce;

+//exec series.sce;

+syms G1 G2 G3 G4 H1 H2 H3;

+a=G4/.H1;

+//shift the summing point after block G3 towards left of block G3

+b=G2/G3;

+c=series(a,G3);

+d=c/(1+c*H2);

+d=simple(d)

+//shift the summing point before block G1 towards right of block G1

+e=G1*H3;

+f=d/(1+d*e);

+f=simple(f)

+g=parallel(G1,b);

+g=simple(g);

+y=series(g,f)

+y=simple (y);

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