(x-y)²(x+y)²

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(x-y)²(x+y)²(x-y)²(x+y)²(x-y)²(x+y)²(x-y)²(x+y)²=[(x+y)(x-y)

(x-y)²(x+y)²
(x-y)²(x+y)²

(x-y)²(x+y)²
(x-y)²(x+y)²
=[(x+y)(x-y)]²
=[x²-y²]²
=x⁴-2x²y²+y⁴