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

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