differentiation

Question: If $y = \frac{{{e^x} + {e^{ - x}}}}{{{e^x} - {e^{ - x}}}}$ then $\frac{{dy}}{{dx}}$ is equal to

1) $\sec {{\rm{h}}^2}x$

2) ${\rm{cosec}}{{\rm{h}}^2}x$

3) $ - \sec \,{{\rm{h}}^2}x$

4) $ - {\rm{cosec}}{{\rm{h}}^2}x$

Solution:

Explanation: Explanation

standard-differentiation

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