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diff --git a/257/CH13/EX13.23/Example_13_23.sce b/257/CH13/EX13.23/Example_13_23.sce
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+syms L1 L2 R1 C X1 X2 X3
+disp("state modle is")
+A=[0 0 -1/L1; 0 -R1/L2 1/L2; 1/C -1/C 0]
+B=[1/L1;0;1]*U
+X=[X1;X2;X3]
+C=[0 R1 0]
+D=0
+disp(A*X+B,"[diff(X1);diff(X2);diff(X3)]=")
+disp(C*X+D,"and Y = ") \ No newline at end of file