x^2(x-y)^2-4(y-x)^2帮帮忙啊~分解因式

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x^2(x-y)^2-4(y-x)^2帮帮忙啊~
分解因式

x^2(x-y)^2-4(y-x)^2
=x^2(x-y)^2-4(x-y)^2
=(x-y)²(x²-4)
=(x-y)²(x+2)(x-2)

=x²(x-y)²-4(x-y)²
=(x-y)²(x²-4)
=(x-y)²(x+2)(x-2)