Ononot — If A is a 2 \times 2 matrix with eigenvalues \lambda1 = 3, \

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Eigenvalues & Eigenvectorsmedium

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If $A$ is a $2 \times 2$ matrix with eigenvalues $\lambda_1 = 3, \lambda_2 = 4$ , what is the determinant of $A^T A$ ?