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4y - y^2 = 0
y(4 - y) = 0
y = 0- atau 4-y = 0 --> y = 4
Batas intergral y = 0 dan y = 4
Luas = ₐᵇ∫ x dy
Luas = ₀⁴∫ 4y -y² dy = 2y² - ¹/₃ y³]⁴₀ = 2(16) - ¹/₃(64) = 10 ²/₃