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x in (-oo:+oo)
C = 3.14*(1/6)*r*v^2 // - 3.14*(1/6)*r*v^2
C-(3.14*(1/6)*r*v^2) = 0
C-0.52333333*r*v^2 = 0
C-0.52333333*r*v^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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