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X^3(x-2y)+y^3(2x-y)
=x^4-2x^3y+2xy^3-y^4
=(x^2+y^2)(x+y)(x-y)-2xy(x^2-y^2)
=(x^2+y^2-2xy)(x+y)(x-y)
=(x-y)^3(x+y)
=x^4-2x^3y+2xy^3-y^4
=(x^2+y^2)(x+y)(x-y)-2xy(x^2-y^2)
=(x^2+y^2-2xy)(x+y)(x-y)
=(x-y)^3(x+y)
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