Ononot — Consider A = \begin{pmatrix} 0 & 1 \\ -1 & 0 \end{pmatrix}.

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Eigenvalues & Eigenvectorshard

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Consider $A = \begin{pmatrix} 0 & 1 \\ -1 & 0 \end{pmatrix}$ . What is the sum of its eigenvalues?