Solve this following

Question:

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

$\int \frac{d x}{\left(4+9 x^{2}\right)}=?$

A. $\frac{2}{3} \tan ^{-1} \frac{3 x}{2}+C$

B. $\frac{1}{6} \tan ^{-1} 3 x+C$

C. $\frac{1}{6} \tan ^{-1} \frac{3 x}{2}+C$

D. none of these

Solution:

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