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x in (-oo:+oo)
V = 3.14*(1/3)*7^2*h // - 3.14*(1/3)*7^2*h
V-(3.14*(1/3)*7^2*h) = 0
V-1.04666667*7^2*h = 0
V-51.28666683*h = 0
x należy do R
x in (-oo:+oo)
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