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x(x - 1) = 0
x = 0 atau x = 1
V = π int[0 - 1] x² - (x²)² dx
= π int[0 - 1] (x² - x^4) dx
= π(1/3 x³ - 1/5 x^5) [0 - 1]
= π(1/3 - 1/5)
= 2π/15 satuan volume