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x in (-oo:+oo)
19.24 = (1/3)*h*r^2 // - (1/3)*h*r^2
19.24-((1/3)*h*r^2) = 0
(-1/3)*h*r^2+19.24 = 0
19.24-1/3*h*r^2 = 0
x należy do R
x in (-oo:+oo)
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