(x⁴+1)(x²+1)(x+1)(x-1)=?

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(x⁴+1)(x²+1)(x+1)(x-1)=?
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(x⁴+1)(x²+1)(x+1)(x-1)=?
(x⁴+1)(x²+1)(x+1)(x-1)=?

(x⁴+1)(x²+1)(x+1)(x-1)=?
(x⁴+1)(x²+1)(x+1)(x-1)
=(x⁴+1)(x²+1)(x²-1)
=(x⁴+1)(x⁴-1)
=x的8次方-1