:4xy²-4x²y-y³

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:4xy²-4x²y-y³:4xy²-4x²y-y³:4xy²-4x²y-y³4xy²-4x

:4xy²-4x²y-y³
:4xy²-4x²y-y³

:4xy²-4x²y-y³
4xy²-4x²y-y³
=-y(4x²-4yx+y²)
=-y(2x-y)²