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x in (-oo:+oo)
v = (1/3)*h*r^2 // - (1/3)*h*r^2
v-((1/3)*h*r^2) = 0
(-1/3)*h*r^2+v = 0
v-1/3*h*r^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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