a²(x-y)³+4b²(y-x)³

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a²(x-y)³+4b²(y-x)³
a²(x-y)³+4b²(y-x)³

a²(x-y)³+4b²(y-x)³
a²(x-y)³+4b²(y-x)³
=a²(x-y)³-4b²(X-Y)³
=(x-y)³(a²-4b²)
=(x-y)³(a+2b)(a-2b)