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

A. $\tan^{- 1} e^{x} + c$
B. $\tan^{- 1} e^{x} + c$
C. $\tan^{- 1} e^{x} + c$
D. $\tan^{- 1} e^{x} + c$

Answer: Option A

Explanation:

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