Compute the determinants in Exercises 1-8 using a cofactor ex- pansion across the first row. In Exercises 1-4, also compute the determinant by a cofactor expansion down the second column. C 4 3 -NA 2. 5 -3 ON W NO 4 U 2 -2 -N NWE 3 -NW 4 A - 3 -1