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r in (-oo:+oo)
3.14*10*r^2*((1*3.14*(4/3)*r^3)/2) = 0
3.14*10*r^2*((3.14*(4/3)*r^3)/2) = 0
65.730666562*r^5 = 0 // : 65.730666562
r^5 = 0
r = 0
r = 0
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