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x in (-oo:+oo)
V = (3.14/3)*h*r^2 // - (3.14/3)*h*r^2
V-((3.14/3)*h*r^2) = 0
V-1.04666667*h*r^2 = 0
V-1.04666667*h*r^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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