There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ ln(tan(7)x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = ln(xtan(7))\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( ln(xtan(7))\right)}{dx}\\=&\frac{(tan(7) + xsec^{2}(7)(0))}{(xtan(7))}\\=&\frac{1}{x}\\ \end{split}\end{equation} \]

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