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x in (-oo:+oo)
V = 3.14*(2/3)*r^3 // - 3.14*(2/3)*r^3
V-(3.14*(2/3)*r^3) = 0
V-2.09333333*r^3 = 0
V-2.09333333*r^3 = 0
x należy do R
x in (-oo:+oo)
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