Ononot — Let A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}. Calcul

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Determinantshard

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Let $A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$ . Calculate $\det(A^2 - 2A)$ .