I have learned a shortcut for finding eigen values and characteristic equation. It is as follows. $\lambda ^{_{3}}- \alpha \lambda ^{2}+ \beta \lambda - \gamma =0$ where $ \alpha =$ trace of 3*3 matrix $ \beta =$ sum of cofactor of diagonal elements $ \gamma =$ det of 3*3 matrix when I follow this logic in the below problem I'm stuck, Could any one help me find why I'm stuck . I was getting answer using this trick for almost all problems
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