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Question
Simplify by using formula :
(1 + a) (1 - a) (1 + a2)
Solution
(1 + a) (1 - a) (1 + a2)
= [(1)2 - (a)2] (1 + a2)
= (1 - a2) (1 + a2)
(Using identify : (a + b)(a - b) = a2 - b2)
= (1)2 - (a2)2
= 1 - a4.
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