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r in (-oo:+oo)
40458.2594 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
40458.2594-(3.14*(4/3)*r^3) = 0
40458.2594-4.18666667*r^3 = 0
-4.18666667*r^3 = -40458.2594 // : -4.18666667
r^3 = 9663.59698275
r^3 = 9663.59698275 // ^ 1/3
r = 9663.59698275^(1/3)
r = 9663.59698275^(1/3)
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