Determine whether the subspaces are orthogonal: S_1 = span {[4 5 - 4], [0 1 1]}, S_2 = span {[5 -4 0]} S_1 = span {[1 1 1 1]}, S_2 = span {[-1 1 -1 1], [0 2 -2 0]} S_1 = span {[0 0 2 1], [0 0 1 -2]}, S_2 = span {[3 2 0 0], [0 1 -2 2]}