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diff --git a/758/CH6/EX6.22/Ex_6_22.sce b/758/CH6/EX6.22/Ex_6_22.sce
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+++ b/758/CH6/EX6.22/Ex_6_22.sce
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+//Example 6.21
+
+clc;clear;
+n=0:3;
+x=cos(n*%pi/2);
+X=clean(fft(x));
+disp(x,'x(n)=');
+disp(X,'X(k)=');
+\ No newline at end of file