Let \( f: \mathbf{R} \rightarrow \mathbf{R} \) be defined by \( f(x...

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Let \( f: \mathbf{R} \rightarrow \mathbf{R} \) be defined by \( f(x)=3 x^{2}-5 \) and \( g: \mathbf{R} \rightarrow \mathbf{R} \) by \( g(x)=\frac{x}{x^{2}+1} \).
\( \mathrm{P} \) Then \( g \) of is

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(A) \( \frac{3 x^{2}-5}{9 x^{4}-30 x^{2}+26} \).
(B) \( \frac{3 x^{2}-5}{9 x^{4}-6 x^{2}+26} \)
(C) \( \frac{3 x^{2}}{x^{4}+2 x^{2}-4} \)
(D) \( \frac{3 x^{2}}{9 x^{4}+30 x^{2}-2} \)
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