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X⁴ - X² = 0
X² ( X²-1) =0
X² (X+1)(X-1) =0
titik potongnya X=-1, X=0, X=1
karena simetris cukup ditung 2 kali daerah dari 0 sampe 1
V = 2π∫(X²)² - (X⁴)² batas integral 0 sampe 1
= 2π∫X⁴ - X⁸ = 2π [(1/5X⁵) - (1/9 X⁹)]
=2π [(1/5 -1/9) -(0)] = 2π (9/45 -5/45) = 8π/45