Solve this following

Question:

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

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

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

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

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

D. none of these

Solution:

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