initial commit / add all books

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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
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