" The trace of the matrix "A=[[1,-5,7],[0,7,9],[11,8,9]]" is "

The trace of the matrix A=[[1,-5,70,7,911,8,9]] is

The adjoint of matrix [(1,1),(5,7)] is:

Express the matrix A as the sum of a symmetric and skew-symmetric matrix, where A=[[1,2,-3],[7,0,5],[-4,8,9]]

Find the order of the matrix [{:(1,2,3,4,5,6,7),(5,6,7,8,4,5,6),(9,10,11,0,10,9,11):}]

Find the inverse of matrix [{:(6,7),(8,9):}]