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x in (-oo:+oo)
c = 3.14*(1/4)*m^2 // - 3.14*(1/4)*m^2
c-(3.14*(1/4)*m^2) = 0
c-0.785*m^2 = 0
c-0.785*m^2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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