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v in (-oo:+oo)
v = 3.14*1000*(4/3) // - 3.14*1000*(4/3)
v-(3.14*1000*(4/3)) = 0
v-12560/3 = 0
v-12560/3 = 0 // + 12560/3
v = 12560/3
v = 12560/3
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