Solve this following


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

$\int \frac{\sin x}{\sqrt{4 \cos ^{2} x-1}}=?$

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

B. $-\frac{1}{3} \log \left|2 \cos x+\sqrt{4 \cos ^{2} x-1}\right|+C$

C. $-\frac{1}{6} \log \left|2 \cos x+\sqrt{2 \cos ^{2} x-1}\right|+C$

D. none of these


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