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+//Example 1.12<i>
+//check whether the given signal is periodic or not
+clc;
+t=-5:.01:5;
+x=%i*(exp(%i*5*t));
+subplot(311)
+plot(t,x);
+disp('(a)This shows that the given signal is periodic with priod(.4*%pi)');
+//Example 1.12<ii>
+//Show whether the given signal is periodic or not
+clc;
+t=-1/5:0.001:1/5;
+x=sin(50*%pi*t);
+subplot(312)
+plot(t,x);
+disp('(b)the plotting shows that the given signal is periodic with period 1/25');
+//Example 1.12.<iii>
+//Check whether the given signal is periodic or not
+clc;
+t=-1:0.01:1;
+x=20*cos((10*%pi*t)+(%pi/6));
+subplot(313)
+plot(t,x);
+disp('(c)Plot shows that the given signal is periodic with period .2');
+
+disp('In the figure we have the plots of part (a) - (c) in clockwise order strating from the top left')
+
+
+
+
+