There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 3sin(4.23x + 2)cos(-4x - 6.55) - tan(3x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 3sin(4.23x + 2)cos(-4x - 6.55) - tan(3x)\right)}{dx}\\=&3cos(4.23x + 2)(4.23 + 0)cos(-4x - 6.55) + 3sin(4.23x + 2)*-sin(-4x - 6.55)(-4 + 0) - sec^{2}(3x)(3)\\=&12.69cos(4.23x + 2)cos(-4x - 6.55) + 12sin(4.23x + 2)sin(-4x - 6.55) - 3sec^{2}(3x)\\ \end{split}\end{equation} \]

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