There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ x*2e^{cos(3x)}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 2xe^{cos(3x)}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 2xe^{cos(3x)}\right)}{dx}\\=&2e^{cos(3x)} + 2xe^{cos(3x)}*-sin(3x)*3\\=&2e^{cos(3x)} - 6xe^{cos(3x)}sin(3x)\\ \end{split}\end{equation} \]

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