There are 1 questions in this calculation: for each question, the 2 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ second\ derivative\ of\ function\ {x}^{3}*3 + {x}^{2}*6 - x\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 3x^{3} + 6x^{2} - x\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 3x^{3} + 6x^{2} - x\right)}{dx}\\=&3*3x^{2} + 6*2x - 1\\=&9x^{2} + 12x - 1\\\\ &\color{blue}{The\ second\ derivative\ of\ function:} \\&\frac{d\left( 9x^{2} + 12x - 1\right)}{dx}\\=&9*2x + 12 + 0\\=&18x + 12\\ \end{split}\end{equation} \]

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