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disp('the given matrix is:')
A=[3 0 4;2 3 2;0 5 -1]
disp(A)
disp('calculating det(A) using cofactor expression along first row')
disp('det(A)=3 X (-1 X 3-5 X 2)+4 X (2 X 5-3 X 0)')
disp(det(A),'=')
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