There are 1 questions in this calculation: for each question, the 1 derivative of r is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ H{\frac{1}{r}}^{e^{t}}a\ with\ respect\ to\ r：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = Ha{\frac{1}{r}}^{e^{t}}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( Ha{\frac{1}{r}}^{e^{t}}\right)}{dr}\\=&Ha({\frac{1}{r}}^{e^{t}}((e^{t}*0)ln(\frac{1}{r}) + \frac{(e^{t})(\frac{-1}{r^{2}})}{(\frac{1}{r})}))\\=&\frac{-Ha{\frac{1}{r}}^{e^{t}}e^{t}}{r}\\ \end{split}\end{equation} \]

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