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A) $y=\frac{2 x}{x^{3}+2}$

B) $y=\frac{2 x}{x^{2}+1}$

C) $y=\frac{2 x^{2}}{x^{2}+1}$

D) $y=\frac{2 x^{3}}{x^{2}+1}$

E) $y=\frac{2 x^{4}}{x^{2}+1}$

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