$\int \frac{dx}{e^x + e^{-x}} = $
- A$\tan^{-1}(e^{-x}) + C$
- B$\tan^{-1}(e^x) + C$
- C$\log(e^x - e^{-x}) + C$
- D$\log(e^x + e^{-x}) + C$
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