Mark against the correct answer in each of the following:

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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