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//ques4.1
//clear
//cd SCI
//cd ("..")
//cd ("..")
//exec symbolic.sce
clc
disp(' we have to find yn for F=cosxcos2xcos3x ');
syms x a
F=x/(x^2+a^2);
n=input('Enter the order of differentiation : ");
disp('calculating yn ');
yn=diff(F,x,n)
disp('the expression for yn is ');
disp(yn);
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