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

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