There are 1 questions in this calculation: for each question, the 4 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ 4th\ derivative\ of\ function\ cot(a)nge^{n}tx\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = ngtxe^{n}cot(a)\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( ngtxe^{n}cot(a)\right)}{dx}\\=&ngte^{n}cot(a) + ngtxe^{n}*0cot(a) + ngtxe^{n}*-csc^{2}(a)*0\\=&ngte^{n}cot(a)\\\\ &\color{blue}{The\ second\ derivative\ of\ function:} \\&\frac{d\left( ngte^{n}cot(a)\right)}{dx}\\=&ngte^{n}*0cot(a) + ngte^{n}*-csc^{2}(a)*0\\=&0\\\\ &\color{blue}{The\ third\ derivative\ of\ function:} \\&\frac{d\left( 0\right)}{dx}\\=&0\\\\ &\color{blue}{The\ 4th\ derivative\ of\ function:} \\&\frac{d\left( 0\right)}{dx}\\=&0\\ \end{split}\end{equation} \]

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