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

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