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

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