If A = , then
A + B = B + A and A + (B + C) = (A + B) + C
A + B = B + A and AC = BC
A + B = B + A and AB = BC
AC = BC and A = BC
If A = [x y z], B = . Then, ABC = O, if
[ax2 + by2 + cz2 + 2gxy + 2fyz + 2czx] = 0
[ax2 + cy2 + bz2 + xy + yz + zx] = 0
[ax2 + by2 + cz2 + 2hxy + 2by + 2cz] = 0
[ax2 + by2 + cz2 + 2zx + 2hxy + 2fyz] = 0
A square matrix is an orthogonal matrix, if
AA' = 0
A + A' = I
AA' = I
None of these
C.
AA' = I
A square matrix is an orthogonal matrix, if AA' = I