There are 1 questions in this calculation: for each question, the 1 derivative of y is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ {(x - 3y)}^{3}\ with\ respect\ to\ y：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = - 9x^{2}y + 27xy^{2} + x^{3} - 27y^{3}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( - 9x^{2}y + 27xy^{2} + x^{3} - 27y^{3}\right)}{dy}\\=& - 9x^{2} + 27x*2y + 0 - 27*3y^{2}\\=&54xy - 9x^{2} - 81y^{2}\\ \end{split}\end{equation} \]

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