Ononot — If A = P D P^{-1} where D = \begin{pmatrix} 3 & 0 \\ 0 & 5 \

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Eigenvalues & Eigenvectorsmedium

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If $A = P D P^{-1}$ where $D = \begin{pmatrix} 3 & 0 \\ 0 & 5 \end{pmatrix}$ , what is the trace of $A^2$ ?