Solve this following

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{\left(x^{2}+1\right)}{\left(x^{4}+x^{2}+1\right)} d x=?$

A. $\tan ^{-1} \frac{\left(x^{2}-1\right)}{\sqrt{3}}+C$

$B .$  $\frac{1}{\sqrt{3}} \tan ^{-1} \frac{\left(x^{2}-1\right)}{\sqrt{3}}+C$

C $\frac{1}{\sqrt{3}} \tan ^{-1} \frac{\left(x^{2}-1\right)}{\sqrt{3} x}+C$

D. none of these

Solution:

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