If A = f(x) = [cos x, sin x, 0; -sin x, cos x, 0; 0, 0, 1], then its inverse matrix A-1 is equal to:

The eigenvalues of the matrix [5 4; 1 2] are:

Every element in the central column of the matrix has a simple arithmetic relationship with the pairs on the left and right in the corresponding row: | 17 12 1 19 23 | | 23 21 X 18 20 | | 24 17 3 32 36 | | 35 28 2 19 24 | What is the value of X?