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x in (-oo:+oo)
(8/1)*f^2 = r/r+1 // - r/r+1
(8/1)*f^2-(r/r)-1 = 0
8*f^2-1-1 = 0
8*f^2-2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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