Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
$f(x)=\frac{x}{\left(x^{2}-1\right)}$ is increasing in
A. $(-1,1)$
B. $(-1, \infty)$
C. $(-\infty,-1) \cup(1, \infty)$
D. none of these
Solution:
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