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

Your problem has not been solved here? Please take a look at the  hot problems ！