There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 4sin(x - y) - 3ycos(x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 4sin(x - y) - 3ycos(x)\right)}{dx}\\=&4cos(x - y)(1 + 0) - 3y*-sin(x)\\=&4cos(x - y) + 3ysin(x)\\ \end{split}\end{equation} \]

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