initial commit / add all books

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diff --git a/964/CH19/EX19.2/19_2.sce b/964/CH19/EX19.2/19_2.sce
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+clc;

+clear;

+a0=0;

+//f(t)=-1 for -T/2 to -T/4

+//f(t)=1 for -T/4 to T/4

+//f(t)=-1 for T/4 to T/2

+//ak=2/T* (integration of f(t)*cos(w0*t) from -T/2 to T/2)

+//ak=2/T*((integration of f(t)*cos(w0*t) from -T/2 to -T/4) + (integration of f(t)*cos(w0*t) from -T/4 to T/4) + (integration of f(t)*cos(w0*t) from T/4 to T/2))

+//Therefore, 

+//ak=4/(k*%pi) for k=1,5,9,.....

+//ak=-4/(k*%pi) for k=3,7,11,.....

+//ak=0 for k=even integers

+//similarly we find the b's.

+//all the b's=0

+disp("The fourier approximtion is:")

+disp("4/(%pi)*cos(w)*t) - 4/(3*%pi)*cos(3*(w)*t) + 4/(5*%pi)*cos(5*(w)*t) - 4/(7*%pi)*cos(7*(w)*t) + .....")
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