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

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