(1-x)(1+x)(1+x²)+(1-x²)²
=(1-x²)(1+x²)+(1-x²)²
=(1-x⁴)+(1-2x²+x⁴)
=1-x⁴+1-2x²+x⁴
=2-2x²
(1-x)(1+x)(1+x²)+(1-x²)²计算
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