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