Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \frac{(\cos 2 x-\cos 2 \alpha)}{(\cos x-\cos \alpha)} d x=?$
A. $\sin x+x \cos \alpha+C$
B. $2 \sin x+x \cos \alpha+C$
C. $2 \sin x+2 x \cos \alpha+C$
D. none of these
Solution:
