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diff --git a/67/CH7/EX7.5/example75.sce b/67/CH7/EX7.5/example75.sce
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+++ b/67/CH7/EX7.5/example75.sce
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+//Example 7.5
+clc;
+syms Wo n z;
+x1=exp(sqrt(-1)*Wo*n);
+X1=symsum(x1*(z^-n),n,0,%inf);
+x2=exp(-sqrt(-1)*Wo*n);
+X2=symsum(x2*(z^-n),n,0,%inf);
+X=(X1+X2)/2;
+disp(X,'X(z)=');
+\ No newline at end of file