Question:
Mark $(\sqrt{)}$ ) against the correct answer in each of the following:
$\int \frac{(1+\tan x)}{(1-\tan x)} d x=?$
A. $-\log |\cos x-\sin x|+C$
B. $\log |\cos x-\sin x|+C$
C. $\log |\cos x+\sin x|+C$
D. none of these
Solution:
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