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Maka:
= (x² × x²) (x² × -y²) + (y² × x²) (y² × -y²)
= (x⁴ - x⁴y⁴) + (x⁴y⁴ - y⁴)
susun menurut variabel dan pangkat :
= x⁴ - y⁴ - x⁴y⁴ + x⁴y⁴
= x⁴ - y⁴