There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ \frac{(3sin(3x))x}{5}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{3}{5}xsin(3x)\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{3}{5}xsin(3x)\right)}{dx}\\=&\frac{3}{5}sin(3x) + \frac{3}{5}xcos(3x)*3\\=&\frac{3sin(3x)}{5} + \frac{9xcos(3x)}{5}\\ \end{split}\end{equation} \]

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