Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \frac{d x}{(1-\tan x)}=?$
A. $\frac{1}{2} \log |\sin x-\cos x|+C$
B. $\frac{1}{2} x+\frac{1}{2} \log |\sin x-\cos x|+C$
C. $\frac{1}{2} x-\frac{1}{2} \log |\sin x-\cos x|+C$
D. none of these
Solution:
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