Cayley Hamilton use to find higher power of non diagnalizable matrix. Reduction not easy for the characteristic equation.

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Mat $A= \left(\begin{smallmatrix}1&0&0\\ 1&0&1\\ 0&1&0\end{smallmatrix}\right)$

Find $A^{30}$.

Cannot diagonalize. Not generic reduction of characteristic equation with eigenvalue $1,1, -1$.

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$A^2=A$. What else do you need?