There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (x{\frac{1}{(x + 1)}}^{2}) + ({\frac{1}{(1 + x)}}^{2})\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{x}{(x + 1)^{2}} + \frac{1}{(x + 1)^{2}}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{x}{(x + 1)^{2}} + \frac{1}{(x + 1)^{2}}\right)}{dx}\\=&(\frac{-2(1 + 0)}{(x + 1)^{3}})x + \frac{1}{(x + 1)^{2}} + (\frac{-2(1 + 0)}{(x + 1)^{3}})\\=&\frac{-2x}{(x + 1)^{3}} - \frac{2}{(x + 1)^{3}} + \frac{1}{(x + 1)^{2}}\\ \end{split}\end{equation} \]

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