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= - 3.[ 1.(- x²)³ + 3.(- x²)²(y) + 3.(- x²)(y)² + 1.(y)³ ] ⇒ prinsip segitiga Pascal
= - 3 [- x⁶ + 3x⁴y - 3x²y² + y³]
= 3x⁶ - 9x⁴y + 9x²y² - 3y³