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V in (-oo:+oo)
V = 3.14*500*(4/3) // - 3.14*500*(4/3)
V-(3.14*500*(4/3)) = 0
V-6280/3 = 0
V-6280/3 = 0 // + 6280/3
V = 6280/3
V = 6280/3
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