If \( f(x)=\frac{2 x+1}{2 x^{3}+3 x^{2}+x} \) and \( S=\{x: f(x)0\}...

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If \( f(x)=\frac{2 x+1}{2 x^{3}+3 x^{2}+x} \) and \( S=\{x: f(x)0\} \) then \( S \) contains
(a) \( (-\infty,-3 / 2) \)
(b) \( (-3 / 2,-1 / 4) \)
(c) \( (-1 / 4,1 / 2) \)
(d) \( (1 / 2,3) \)
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