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diff --git a/67/CH6/EX6.4/example64.sce b/67/CH6/EX6.4/example64.sce
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+//Example 6.4
+clc;
+disp('x(t)=6cos(50%pi*t)+20sin(300%pi*t)-10cos(100%pi*t)');
+w1=50*%pi;
+w2=300*%pi;
+w3=100*%pi;
+f1=w1/(2*%pi);
+f2=w2/(2*%pi);
+f3=w3/(2*%pi);
+if f1>f2 then
+    if f1>f3 then
+        disp(2*f1,'Nyquist rate=');
+    else 
+        disp(2*f3,'Nyquist rate=');
+    end
+else
+    if f2>f3 then
+        disp(2*f2,'Nyquist rate=');
+    else
+        disp(2*f3,'Nyquist rate=');
+    end
+end
+\ No newline at end of file