Question

find product (a-1)(a+1)(a2+1)(a4+1) step by step

Answer 1

(a^2-1)(a^6+a^2+a^4+1)
=a^8-a^6+a^4-a^2+a^6-a^4+a^2-1
=a^8-1

it is your answer. .....


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