MCQ
$\int \frac{e^x-e^{-x}}{e^x+e^{-x}} d x=$
- A$\log \left|e^x-e^{-x}\right|+C$
- B$\log \cos x+C$
- C$\log \sin x+C$
- ✓$\log \left|e^x+e^{-x}\right|+C$
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