Solve this following

Question:

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

$\int \frac{\cos x}{\sqrt{\sin ^{2} x-2 \sin x-3}} d x=?$

A. $\log \left|\sin x+\sqrt{\sin ^{2} x-2 \sin x-3}\right|+C$

B. $\log \left|(\sin x-1)+\sqrt{\sin ^{2} x-2 \sin x-3}\right|+C$

C. $\log \left|(\sin x-1)-\sqrt{\sin ^{2} x-2 \sin x-3}\right|+C$

D. none of these

Solution:

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