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diff --git a/3673/CH17/EX17.a.4/Example_a_17_4.sce b/3673/CH17/EX17.a.4/Example_a_17_4.sce
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+//Example_a_17_4 page no:866
+clc;
+f=1.5*10^3;
+L=40*10^-3;
+C=0.12*10^-6;
+fc=1/(%pi*sqrt(L*C));
+ZoT=sqrt(L/C)*sqrt(1-(f/fc)^2);
+phase_shift=2*asind(f/fc);
+disp(fc/1000,"the cut off frequency is (in kHz)");
+disp(ZoT,"the iterative impedence is (in ohm)");
+disp(phase_shift,"the phase shift is (in degree)");