1. Find the determinant of the matrix 1 1 3 0 -1 11-4 A 0 1...

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1. Find the determinant of the matrix 1 1 3 0 -1 11-4 A 0 1 2 0 2-10 9 2. An n x n matrix A is said to be skew-symmetric if ATA. Show that if A is an n x n skew-symmetric matrix, then the diagonal entries of A are all zero. 1. Find the determinant of the matrix 1 1 3 0 -1 11-4 A 0 1 2 0 2-10 9 2. An n x n matrix A is said to be skew-symmetric if ATA. Show that if A is an n x n skew-symmetric matrix, then the diagonal entries of A are all zero.