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