There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ -9cos(x) + 9xsin(x) - 4csin(x) + 2ccos(x) - 2cxsin(x) + 6\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( -9cos(x) + 9xsin(x) - 4csin(x) + 2ccos(x) - 2cxsin(x) + 6\right)}{dx}\\=&-9*-sin(x) + 9sin(x) + 9xcos(x) - 4ccos(x) + 2c*-sin(x) - 2csin(x) - 2cxcos(x) + 0\\=&18sin(x) + 9xcos(x) - 4ccos(x) - 4csin(x) - 2cxcos(x)\\ \end{split}\end{equation} \]

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