Mark against the correct answer in each of the following:
Question:

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

$\int \frac{\sin (x-\alpha)}{\sin (x+\alpha)} d x=?$

A. $x \cos 2 \alpha-\sin 2 \alpha \cdot \log |\sin (x+\alpha)|+C$

B. $x \cos 2 \alpha+\sin 2 \alpha \cdot \log |\sin (x+\alpha)|+C$

C. $x \cos 2 \alpha+\sin \alpha \cdot \log |\sin (x+\alpha)|+C$

D. none of these

Solution:

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