(x-y)³(y-x)(y-x)²+(x-y)^6
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(x-y)³(y-x)(y-x)²+(x-y)^6(x-y)³(y-x)(y-x)²+(x-y)^6(x-y)³(y-x)(y-x)²+(x
(x-y)³(y-x)(y-x)²+(x-y)^6
(x-y)³(y-x)(y-x)²+(x-y)^6
(x-y)³(y-x)(y-x)²+(x-y)^6
(x-y)³(y-x)(y-x)²+(x-y)^6
=-(x-y)^6+(x-y)^6
=0