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x in (-oo:+oo)
V = (1/3)*a^2*h // - (1/3)*a^2*h
V-((1/3)*a^2*h) = 0
V+(-1/3)*a^2*h = 0
V-1/3*a^2*h = 0
x naleu017Cy do R
x in (-oo:+oo)
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