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v in (-oo:+oo)
v = 3.14*17*(1/3)*20^2 // - 3.14*17*(1/3)*20^2
v-(3.14*17*(1/3)*20^2) = 0
v-17.79333333*20^2 = 0
v-7117.333332 = 0 // + 7117.333332
v = 7117.333332
v = 7117.333332
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