There are 1 questions in this calculation: for each question, the 4 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ 4th\ derivative\ of\ function\ arch(x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( arch(x)\right)}{dx}\\=&arsh(x)\\=&arsh(x)\\\\ &\color{blue}{The\ second\ derivative\ of\ function:} \\&\frac{d\left( arsh(x)\right)}{dx}\\=&arch(x)\\=&arch(x)\\\\ &\color{blue}{The\ third\ derivative\ of\ function:} \\&\frac{d\left( arch(x)\right)}{dx}\\=&arsh(x)\\=&arsh(x)\\\\ &\color{blue}{The\ 4th\ derivative\ of\ function:} \\&\frac{d\left( arsh(x)\right)}{dx}\\=&arch(x)\\=&arch(x)\\ \end{split}\end{equation} \]

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