( a2 + 1) (a4 – a2 + 1)
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(a2 + 1) (a4 - a2 +1)
= a2 (a4 -a2 +1) +1(a4 - a2+1)
= a6 -a4 +a2 +a4 -a2 +1
= a6 -a4 +a4 +a2 -a2 +1
= a6 +1
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