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diff --git a/29/CH4/EX4.4.9/exa4_4_9.sce b/29/CH4/EX4.4.9/exa4_4_9.sce
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+//Caption:overall_transfer_function
+// example 4.4.9
+//page 71
+// 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 H5 H1 H2;
+//shift the SUMMING point locsted after G3 towards left of block G3
+a=G2/.H1;
+b=G5/G3;
+c=parallel(a,b);
+c=simple(c);
+d=G3/.H2;
+e=series(G1,c);
+f=series(e,d);
+y=series(G4,f);
+y=simple (y);
+disp(y,"C(s)/R(s)=")
+\ No newline at end of file