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

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