Which of the following is an odd function? (a) \( x+x^{3} \) (b) \( x^{3}-x^{2}-5 \) (c) \( x^{2...

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Which of the following is an odd function?
(a) \( x+x^{3} \)
(b) \( x^{3}-x^{2}-5 \)
(c) \( x^{2}+x^{4} \)
(d) \( \frac{3 x^{2}}{x^{2}+1} \)
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