-2xy(x²-3y²)-4xy(2x²+y²)

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-2xy(x²-3y²)-4xy(2x²+y²)-2xy(x²-3y²)-4xy(2x²+y²)-2xy(x²

-2xy(x²-3y²)-4xy(2x²+y²)
-2xy(x²-3y²)-4xy(2x²+y²)

-10x^3y-2xy^3