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Question Number 71983 by device4438043516@gmail.com last updated on 23/May/20

Answered by Henri Boucatchou last updated on 23/Oct/19

$$\mathit{d}\left({\mathit{e}}^{\mathit{v}\mathit{l}\mathit{n}\mathit{u}}\right)={\mathit{u}}^{\mathit{v}}\mathit{d}\left(\mathit{v}\mathit{l}\mathit{n}\mathit{u}\right)$$$$={\mathit{u}}^{\mathit{v}}(\mathit{l}\mathit{n}\mathit{u}\mathit{d}\mathit{v}+\mathit{v}\frac{\mathit{d}\mathit{u}}{\mathit{u}})$$

Commented by Henri Boucatchou last updated on 23/Oct/19

$${\mathit{T}\mathit{h}\mathit{a}\mathit{n}\mathit{k}}^{\prime }\mathit{s},{\mathit{y}\mathit{o}\mathit{u}}^{\prime }\mathit{r}\mathit{e}\mathit{w}\mathit{e}\mathit{l}\mathit{c}\mathit{o}\mathit{m}\mathit{e}$$

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