There are 3 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/3]Find\ the\ first\ derivative\ of\ function\ s*2fc\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 2sfc\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 2sfc\right)}{dx}\\=&0\\ \end{split}\end{equation} \]

\[ \begin{equation}\begin{split}[2/3]Find\ the\ first\ derivative\ of\ function\ 3c*2c\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 6c^{2}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 6c^{2}\right)}{dx}\\=&0\\ \end{split}\end{equation} \]

\[ \begin{equation}\begin{split}[3/3]Find\ the\ first\ derivative\ of\ function\ 2r*3\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 6r\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 6r\right)}{dx}\\=&0\\ \end{split}\end{equation} \]

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