Ononot — Let A be a 3 \times 2 real matrix. If the eigenvalues of A^T

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Eigenvalues & Eigenvectorshard

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Let $A$ be a $3 \times 2$ real matrix. If the eigenvalues of $A^T A$ are $4$ and $9$ , what are the eigenvalues of the $3 \times 3$ matrix $A A^T$ ?