Compute the determinants in Exercises 1-2 using a cofactor expansion across the first row. In Exercises 1-2,

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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.
Compute the determinants in Exercises 1-2 using a cofactor expansion

2.

Compute the determinants in Exercises 1-2 using a cofactor expansion
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