There are 1 questions in this calculation: for each question, the 1 derivative of R is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ {e}^{2}R{\frac{1}{(R + r)}}^{2}\ with\ respect\ to\ R：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{Re^{2}}{(R + r)^{2}}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{Re^{2}}{(R + r)^{2}}\right)}{dR}\\=&(\frac{-2(1 + 0)}{(R + r)^{3}})Re^{2} + \frac{e^{2}}{(R + r)^{2}} + \frac{R*2e*0}{(R + r)^{2}}\\=&\frac{-2Re^{2}}{(R + r)^{3}} + \frac{e^{2}}{(R + r)^{2}}\\ \end{split}\end{equation} \]

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