There are 1 questions in this calculation: for each question, the 1 derivative of R is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 4R(h - R)\ with\ respect\ to\ R：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 4hR - 4R^{2}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 4hR - 4R^{2}\right)}{dR}\\=&4h - 4*2R\\=&4h - 8R\\ \end{split}\end{equation} \]

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