Solve this following
Question:

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

$\int \frac{d x}{\left(1-9 x^{2}\right)}=?$

A. $\frac{1}{3} \log \left|\frac{1+3 x}{1-3 x}\right|+C$

B. $\frac{1}{3} \log \left|\frac{1-3 x}{1+3 x}\right|+C$

C. $\frac{1}{6} \log \left|\frac{1+3 x}{1-3 x}\right|+C$

D. $\frac{1}{6} \log \left|\frac{1-3 x}{1+3 x}\right|+C$

Solution:

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