3. [6 marks] Write down matrices A1, A2, A3 that correspond to the respective linear transformations of the plane: T1 = i\"re'j'ctection across the tine y = :r\" T2 = \"rotation through 90 ctockwise\" T3 = \"reection across the y axis\" (a) Use matrix multiplication to determine the geometric effect of a rotation through 90 clockwise followed by a reection across the line 3; : .1:, i.e., T2 followed by T1. Questions continue on the next page . . . (b) Use matrix multiplication to determine the combined effect of T1 followed by T2 followed by T3