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diff --git a/29/CH3/EX3.2.7/exa3_2_7.sce b/29/CH3/EX3.2.7/exa3_2_7.sce
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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)=")
+\ No newline at end of file