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In Exercises 1-8, evaluate the determinant of the given matrix. If the determinant is zero, find a nonzero vector x such that Ax = 0. (We will see later that det(A) = 0 if and only if A is singular.)\f\f\f\fIn Exercises 9-14, calculate the cofactors All, A12, A13, and A33 for the given matrix A.\f