There are 3 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/3]Find\ the\ first\ derivative\ of\ function\ sin(n)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( sin(n)\right)}{dx}\\=&cos(n)*0\\ \end{split}\end{equation} \]

\[ \begin{equation}\begin{split}[2/3]Find\ the\ first\ derivative\ of\ function\ cos(s)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( cos(s)\right)}{dx}\\=&-sin(s)*0\\ \end{split}\end{equation} \]

\[ \begin{equation}\begin{split}[3/3]Find\ the\ first\ derivative\ of\ function\ tan(n)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( tan(n)\right)}{dx}\\=&sec^{2}(n)(0)\\=&0\\ \end{split}\end{equation} \]

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