1 . ∫dxex+e-x

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

Answer: Option C

Explanation: