(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)

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(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)(x+y)的2次方(x-y)的2

(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)
(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)

(x+y)的2次方(x-y)的2次方-(x-y)(x+y)(x的2次方+y的2次方)
原式=(x²-y²)²-(x²-y²)(x²+y²)
=x⁴-2x²y²+y⁴-x⁴+y⁴
=-2x²y²+2y⁴