Solve this following
Question:

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

$\int \frac{\mathrm{dx}}{\left(4 \mathrm{x}^{2}-1\right)}=?$

A. $\frac{1}{2} \log \left|\frac{2 x-1}{2 x+1}\right|+C$

B. $\frac{1}{2} \log \left|\frac{2 \mathrm{x}+1}{2 \mathrm{x}-1}\right|+\mathrm{C}$

C. $\frac{1}{4} \log \left|\frac{2 x-1}{2 x+1}\right|+C$

D. none of these

Solution:

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