Ononot — If A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}, what is

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Determinantsmedium

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If $A = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$ , what is $\det(A^2 - A)$ ?