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v in (-oo:+oo)
v = 2.5*3.14*16*(1/3) // - 2.5*3.14*16*(1/3)
v-(2.5*3.14*16*(1/3)) = 0
v-41.86666667 = 0
v-41.86666667 = 0 // + 41.86666667
v = 41.86666667
v = 41.86666667
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