There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 21{x}^{8} + 72{x}^{7} + 56{x}^{6} + 84{x}^{4} + 112{x}^{3} - 84{x}^{2} - 168x + 43\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 21x^{8} + 72x^{7} + 56x^{6} + 84x^{4} + 112x^{3} - 84x^{2} - 168x + 43\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 21x^{8} + 72x^{7} + 56x^{6} + 84x^{4} + 112x^{3} - 84x^{2} - 168x + 43\right)}{dx}\\=&21*8x^{7} + 72*7x^{6} + 56*6x^{5} + 84*4x^{3} + 112*3x^{2} - 84*2x - 168 + 0\\=&168x^{7} + 504x^{6} + 336x^{5} + 336x^{3} + 336x^{2} - 168x - 168\\ \end{split}\end{equation} \]

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