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x in (-oo:+oo)
a = 3.14*(1/8)*r^2*v // - 3.14*(1/8)*r^2*v
a-(3.14*(1/8)*r^2*v) = 0
a-0.3925*r^2*v = 0
a-0.3925*r^2*v = 0
x należy do R
x in (-oo:+oo)
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