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