initial commit / add all books

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diff --git a/2303/CH1/EX1.4/EX_1_4.sce b/2303/CH1/EX1.4/EX_1_4.sce
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+//Example 1 4

+clc ;

+clear;

+close;

+f=9;      //assuming frequency to be a constant 9Hz.

+t =0:.01:10;

+x= cos (2* %pi *f*t);

+plot (t,x);

+xlabel('Time');

+ylabel('Amplitude');

+title('Plot of given sequence to test periodicity');

+disp ( 'Plotting the signal and showing that it is periodic with period=1/f' );