Ononot — Consider the 2×2 rotation matrix R = \begin{bmatrix} 0 & -1

Eigenvalues & Eigenvectorsmedium

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Consider the 2×2 rotation matrix $R = \begin{bmatrix} 0 & -1 \\ 1 & 0 \end{bmatrix}$ which rotates vectors 90° counterclockwise. Which statement(s) is/are true?