There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (\frac{400π}{3})x - (\frac{π}{3}){x}^{2}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{400}{3}πx - \frac{1}{3}πx^{2}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{400}{3}πx - \frac{1}{3}πx^{2}\right)}{dx}\\=&\frac{400}{3}π - \frac{1}{3}π*2x\\=& - \frac{2πx}{3} + \frac{400π}{3}\\ \end{split}\end{equation} \]

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