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Dengan binomial newton:
Koefisien x⁴
= ₆C₄ (x)⁴ (2y)⁶⁻⁴
= 6!/4!(6-4)! x⁴ (2y)²
= 6.5/2! x⁴. 4y²
= 3.5.x⁴.4y²
= 60x⁴y²
Maka, koefisiennya adalah 60