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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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+++ 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) + .....")
+\ No newline at end of file