(ii) 
Answer:
(i) 
= (cos 
) × (cos ) ? (sin ) × (?sin )
= cos2 + sin2
=1
(ii) 
= (x2 ? x + 1) (x + 1) ?
(x + 1) (x ? 1)
= (x3 + 1) ? (x2
? )
= x3 ? x2 + 2.
You need to login to perform this action.
You will be redirected in
3 sec
