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diff --git a/149/CH4/EX4.9/ques9.sce b/149/CH4/EX4.9/ques9.sce
new file mode 100755
index 000000000..364058990
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+++ b/149/CH4/EX4.9/ques9.sce
@@ -0,0 +1,24 @@
+//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');