Question: Compute the determinants in Exercises 1-2 using a cofactor expansion across the first row. In Exercises 1-2, also compute the 3. determinant by a cofactor

Compute the determinants in Exercises 1-2 using a cofactor expansion across the first row. In Exercises 1-2, also compute the 3. determinant by a cofactor expansion down the second column.
1.

421 035 101 042

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