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diff --git a/52/CH1/EX1.5.d/Example1_5_d.sce b/52/CH1/EX1.5.d/Example1_5_d.sce
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+//Example 1.5 (d)
+//To Determine Whether Given Signal is Periodic or not
+clear;
+clc ;
+close ;
+t=0:0.01:50;
+x1=cos(%pi*t/3)+cos(3*%pi*t/4);
+subplot(1,2,1);
+plot(t,x1);
+xlabel('t');
+ylabel('x(t)');
+title('CONTINUOUS TIME PLOT');
+n=0:0.2:50;
+x2=cos(%pi*n/3)+cos(3*%pi*n/4);
+subplot(1,2,2);
+plot2d3(n,x2);
+xlabel('n');
+ylabel('x(n)');
+title('DISCRETE TIME PLOT');
+//Hence Given Signal is Periodic with N=24
+\ No newline at end of file