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v in (-oo:+oo)
v = 9*(1/3)^3.14*4^2 // - 9*(1/3)^3.14*4^2
v-(9*(1/3)^3.14*4^2) = 0
v-9*4^2*(1/3)^3.14 = 0
v-144*(1/3)^3.14 = 0 // + -144*(1/3)^3.14
v = -(-144*(1/3)^3.14)
v = 144*(1/3)^3.14
v = 144*(1/3)^3.14
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