There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 20ln(t + 1){\frac{1}{(t + 1)}}^{2}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{20ln(t + 1)}{(t + 1)^{2}}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{20ln(t + 1)}{(t + 1)^{2}}\right)}{dx}\\=&20(\frac{-2(0 + 0)}{(t + 1)^{3}})ln(t + 1) + \frac{20(0 + 0)}{(t + 1)^{2}(t + 1)}\\=&0\\ \end{split}\end{equation} \]

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