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1. $\int \frac{d x}{e^{x} + e^{- x}}$

A. $\tan^{- 1} (e^{- x})$
B. $\tan^{- 1} (e^{- x})$
C. $\tan^{- 1} (e^{- x})$
D. $\tan^{- 1} (e^{- x})$

Answer: Option C

Explanation:

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