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x in (-oo:+oo)
H = r^2*((3*v)/3.14) // - r^2*((3*v)/3.14)
H-(r^2*((3*v)/3.14)) = 0
H-0.95541401*r^2*v = 0
H-0.95541401*r^2*v = 0
x naleu017Cy do R
x in (-oo:+oo)
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