There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 2xcos(60)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 2xcos(60)\right)}{dx}\\=&2cos(60) + 2x*-sin(60)*0\\=&2cos(60)\\ \end{split}\end{equation} \]

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