There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ sqrt(r) + {sqrt(r)}^{7}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = sqrt(r) + sqrt(r)^{7}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( sqrt(r) + sqrt(r)^{7}\right)}{dx}\\=&\frac{0*\frac{1}{2}}{(r)^{\frac{1}{2}}} + \frac{7(r)^{3}*0*\frac{1}{2}}{(r)^{\frac{1}{2}}}\\=&\frac{0}{2}\\ \end{split}\end{equation} \]

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