Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
$\int \cos (\log x) d x=?$
A. $\frac{x}{2}[\cos (\log x)-\sin (\log x)]+C$
B. $\frac{x}{2}[\cos (\log x)+\sin (\log x)]+C$
C. $2 x[\cos (\log x)+\sin (\log x)]+C$
D. $2 x[\cos (\log x)-\sin (\log x)]+C$
Solution:
