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x in (-oo:+oo)
F = 3.14*(1/9)*n*r^2 // - 3.14*(1/9)*n*r^2
F-(3.14*(1/9)*n*r^2) = 0
F-0.34888889*n*r^2 = 0
F-0.34888889*n*r^2 = 0
x należy do R
x in (-oo:+oo)
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