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

Your problem has not been solved here? Please take a look at the  hot problems ！