Simplify (x - y)³ – (x + y)³
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=x³+y³+3xy(x+y)-(x²+y²-2xy)(x-y)
=x³+y³+3x²y+3xy²-x³+y³+3x²y-3xy²
=2y³+6x²y
=2y(y²+3x²)
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