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v in (-oo:+oo)
v = 1*3.14*(4/3) // - 1*3.14*(4/3)
v-(1*3.14*(4/3)) = 0
v-4.18666667 = 0
v-4.18666667 = 0 // + 4.18666667
v = 4.18666667
v = 4.18666667
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