There are 1 questions in this calculation: for each question, the 2 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ second\ derivative\ of\ function\ -6cos(2x) + 8sin(2x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( -6cos(2x) + 8sin(2x)\right)}{dx}\\=&-6*-sin(2x)*2 + 8cos(2x)*2\\=&12sin(2x) + 16cos(2x)\\\\ &\color{blue}{The\ second\ derivative\ of\ function:} \\&\frac{d\left( 12sin(2x) + 16cos(2x)\right)}{dx}\\=&12cos(2x)*2 + 16*-sin(2x)*2\\=&24cos(2x) - 32sin(2x)\\ \end{split}\end{equation} \]

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