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

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