Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \sec ^{2} x \operatorname{cosec}^{2} x d x=?$
A. $\tan x-\cot x+C$
B. $\tan x+\cot x+C$
C. $-\tan x+\cot x+C$
D. none of these
Solution:
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