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

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