Ononot — The matrix R = \begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}

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Eigenvalues & Eigenvectorseasy

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The matrix $R = \begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ represents a 90° counterclockwise rotation. What are its eigenvalues?