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

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