(x-y)²(y-x)²

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(x-y)²(y-x)²(x-y)²(y-x)²(x-y)²(y-x)²(x-y)²(y-x)²=(x-y)²

(x-y)²(y-x)²
(x-y)²(y-x)²

(x-y)²(y-x)²
(x-y)²(y-x)²
=(x-y)²(x-y)²
=(x-y)^(2+2)
=(x-y)^4