2
4
–5
–1
2 (i)
cos
–sin
sin
cos
θ
θ
θ
θ
(ii)
2 –
1
– 1
1
1
x
x
x
x
x
+
+
+
3 If
A = 
1
2
4
2






, then show that | 2A | = 4 | A |
4 If
A = 
1
0
1
0
1
2
0
0
4










, then show that | 3 A | = 27 | A |
5