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Determinantshard
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For matrix M=(21−10321−14)M = \begin{pmatrix} 2 & 1 & -1 \\ 0 & 3 & 2 \\ 1 & -1 & 4 \end{pmatrix}M=​201​13−1​−124​​, compute det⁡(M)\det(M)det(M) using cofactor expansion along row 1 and verify by expanding along column 2. Do the results agree?