There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 4 + {x}^{2} - 2y + 2{y}^{2} - 2x - xy\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = x^{2} - yx + 2y^{2} - 2x - 2y + 4\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( x^{2} - yx + 2y^{2} - 2x - 2y + 4\right)}{dx}\\=&2x - y + 0 - 2 + 0 + 0\\=&2x - y - 2\\ \end{split}\end{equation} \]

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