There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ -6xcos(x) - x*3cos(x) + 4ccos(x) + 2cx*2cos(x) + 6x - c*2xcos(x) - 4c\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = -9xcos(x) + 4ccos(x) + 2cxcos(x) + 6x - 4c\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( -9xcos(x) + 4ccos(x) + 2cxcos(x) + 6x - 4c\right)}{dx}\\=&-9cos(x) - 9x*-sin(x) + 4c*-sin(x) + 2ccos(x) + 2cx*-sin(x) + 6 + 0\\=&-9cos(x) + 9xsin(x) - 4csin(x) + 2ccos(x) - 2cxsin(x) + 6\\ \end{split}\end{equation} \]

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