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x = 2
x = 4
sumbu x
V = π ₐᵇ∫ y² dx
V = π ₂⁴∫ (¹/₂ x + 1)² dx
V = π ₂⁴∫ ( ¹/₄ x² + x + 1) dx
V = π [¹/₁₂ x³ + ¹/₂ x² + x ]⁴₂
V = π [ ¹/₁₂(64-8) + ¹/₂(16-4) +(4-2)]
V = π [ ⁵⁶/₁₂ + 6 + 2]
V = π [ 12 ²/₃]