(×+1)2(×-1)2(×2+12) *為平方乘法公式展開?

2016-07-23 9:19 am

回答 (1)

2016-07-23 10:02 am

(x+1)^2 (x-1)^2 (x^2+1^2)
=(x^2 -1)^2 (x^2+1)
=(x^4 -2x^2+1)(x^2+1)
=x^6-2x^4+x^2+x^4 -2x^2+1
=x^6-x^4-x^2+1

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