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