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:
