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

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