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r in (-oo:+oo)
1097.5095 = 3.14*(4/3)*r*r*r // - 3.14*(4/3)*r*r*r
1097.5095-(3.14*(4/3)*r*r*r) = 0
1097.5095-4.18666667*r^3 = 0
-4.18666667*r^3 = -1097.5095 // : -4.18666667
r^3 = 262.14398864
r^3 = 262.14398864 // ^ 1/3
r = 262.14398864^(1/3)
r = 262.14398864^(1/3)
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