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r in (-oo:+oo)
1436.0267 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
1436.0267-(3.14*(4/3)*r^3) = 0
1436.0267-4.18666667*r^3 = 0
-4.18666667*r^3 = -1436.0267 // : -4.18666667
r^3 = 343.00000769
r^3 = 343.00000769 // ^ 1/3
r = 343.00000769^(1/3)
r = 343.00000769^(1/3)
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