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x in (-oo:+oo)
v = (3.14*3.14*h*r*r)/3 // - (3.14*3.14*h*r*r)/3
v-((3.14*3.14*h*r*r)/3) = 0
v-3.28653333*h*r^2 = 0
v-3.28653333*h*r^2 = 0
x należy do R
x in (-oo:+oo)
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