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r in (-oo:+oo)
4.36 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
4.36-(3.14*(4/3)*r^3) = 0
4.36-4.18666667*r^3 = 0
-4.18666667*r^3 = -4.36 // : -4.18666667
r^3 = 1.04140127
r^3 = 1.04140127 // ^ 1/3
r = 1.04140127^(1/3)
r = 1.04140127^(1/3)
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