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.
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