Medium
If $y = \frac{e^x + e^{-x}}{e^x - e^{-x}}$,then $\frac{dy}{dx}$ is equal to
- A$\text{sech}^2 x$
- B$\text{cosech}^2 x$
- C$-\text{sech}^2 x$
- D$-\text{cosech}^2 x$
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