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V in (-oo:+oo)
V = 3*3.14*(1/3)*(3/4)^2 // - 3*3.14*(1/3)*(3/4)^2
V-(3*3.14*(1/3)*(3/4)^2) = 0
V-3.14*(3/4)^2 = 0
V-1.76625 = 0 // + 1.76625
V = 1.76625
V = 1.76625
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