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