There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ cos({x}^{(\frac{4}{5})})\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( cos({x}^{\frac{4}{5}})\right)}{dx}\\=&-sin({x}^{\frac{4}{5}})({x}^{\frac{4}{5}}((0)ln(x) + \frac{(\frac{4}{5})(1)}{(x)}))\\=&\frac{-4sin(x^{\frac{4}{5}})}{5x^{\frac{1}{5}}}\\ \end{split}\end{equation} \]

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