a) Find A", BT,A- B, (A + B)",AB, BA if they exist. b) Is the following inequality always true: CD + DC ? Give an example. c) If the matrix product CD exists, does the following equality always holds: (CD)" = DCT ? Give an example. 1 2. 1 - 1 Let A = (3 4), B= ( 2 1). 5 6 -3 4