(x-1)(x+1)(x的2次方+1)-(x的4次方+1)

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(x-1)(x+1)(x的2次方+1)-(x的4次方+1)
(x-1)(x+1)(x的2次方+1)-(x的4次方+1)

(x-1)(x+1)(x的2次方+1)-(x的4次方+1)
(x-1)(x+1)(x的2次方+1)-(x的4次方+1)
=(X^2-1)(x^2+1)-(x^4+1)
=(x^4-1)-(x^4+1)
=-2

=(x²-1)(x²+1)-(x的4次方+1)
=x的4次方-1-x的4次方-1
=-2