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diff --git a/257/CH11/EX11.3/example_11_3.sce b/257/CH11/EX11.3/example_11_3.sce
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+//there is no pole or zero at the origin as the slope is initially 0
+
+wc1=1
+y1=poly([1 1 ],'s','coeff');
+ 
+// mag at wc2 is -20 and wc1 is 0. hence wc1 and wc2 are a decade apart.
+
+wc2=10
+y2=poly([1 1/wc2 ],'s','coeff');
+disp(y2)
+
+// mag at wc2 is -20 and at w=1000 is 0. hence wc2 and wc3 are decade apart.
+
+wc3=100
+y3=poly([1 1/wc3 ],'s','coeff');
+
+wc4=1000       //given
+y4=poly([1 1/wc4 ],'s','coeff');
+
+TF= (y2*y3)/(y1*y4)
+disp(TF,"transfer function = ")