Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{d x}{\left(e^{x}+e^{-x}\right)}=?$

A. $\cot -1\left(e^{x}\right)+C$

B. $\tan -1\left(e^{x}\right)+C$

C. $\log \left|e^{x}+1\right|+C$

D. none of these

Solution:

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