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

\frac{1}{a} \tan^{- 1} (e^{a x}) + c

\frac{1}{a} c o t^{- 1} (e^{a x}) + c

\frac{1}{a} c o t^{- 1} (1 + e^{a x}) + c

\frac{1}{a} \tan^{- 1} (1 + e^{a x}) + c

1 n \tan^{- 1} (e^{- a x}) + c

ANSWER : 1

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