ajutati ma va rog frumos cls a 8
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[tex]f(\sqrt{2}) = \frac{1-2(\sqrt{2})^{2} }{(\sqrt{2})^{2} +1 } = \frac{1-2*2}{2+1} = \frac{1-4}{3}= \frac{-3}{3} = -1[/tex]