Ononot — What is the trace of the matrix A = \begin{pmatrix} 1 & 2 &

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Eigenvalues & Eigenvectorshard

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What is the trace of the matrix $A = \begin{pmatrix} 1 & 2 & 3 \\ 0 & 4 & 5 \\ 0 & 0 & 6 \end{pmatrix}$ ?