x³y + y ² - (x³ +3x²y +3xy² + y³ ).... subtracte it
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x³y + y ² - (x³ +3x²y +3xy² + y³ )
= x³y + y ² - x³ - 3x²y - 3xy² - y³
= -2x³y + y ² - x³ - 3xy² - y³
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