initial commit / add all books

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diff --git a/149/CH4/EX4.9/ques9.sce b/149/CH4/EX4.9/ques9.sce
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+//ques4.1

+//clear

+//cd SCI

+//cd ("..")

+//cd ("..")

+//exec symbolic.sce 

+clc

+disp(' y=e^(a(sin^-1)x)) --sign inverse x ');

+syms x a

+y=%e^(a*(asin(x)));

+disp('we have to prove (1-x^2)y(n+2)-(2n+1)xy(n+1)-(n^2+a^2)yn ') ;

+//n=input('Enter the order of differentiation ");

+disp('calculating  yn for various values of n');

+for n=1:4

+  

+  //yn=diff(F,x,n)

+  F=(1-x^2)*diff(y,x,n+2)-(2*n+1)*x*diff(y,x,n+1)-(n^2+a^2)*diff(y,x,n);

+  disp(n); 

+  disp('the expression for yn is ');

+  disp(F);

+  disp('Which is equal to 0 ');

+

+end

+disp('Hence proved');