I want to calculate the eigenvalues and eigenvectors of matrix A. I did it with two methods.
Method A: I solved the expressions of eigenvalues and eigenvectors of Matrix A firstly, and then specific values were substituted for the solutions.
Method B: Specific values were substituted into Matrix A firstly, and then its eigenvalues and eigenvectors were solved.
However, I got different results with these two methods. I wonder what the reason is for the difference and which result is right.
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