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x in (-oo:+oo)
v = 3.14*(1/3)*r^2 // - 3.14*(1/3)*r^2
v-(3.14*(1/3)*r^2) = 0
v-1.04666667*r^2 = 0
v-1.04666667*r^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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