Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\displaystyle\frac{d}{d x } \left( { \left( { e }^{ x } - { e }^{ -x } \right) }^{ -1 } \right)$$

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