[中學] 因式分解

[iverson33344 (iverson33344)]

題目如下
(1+y)^2 -2x^2(1+y^2) +x^4(1-y)^2 =???

答案(x-xy+1+y)(x-xy-1-y)(x-1)(x+1)

懇求高手幫忙!!!!謝謝!!!

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