There are 1 questions in this calculation: for each question, the 1 derivative of A is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ 29.49 + 1.602A + 5.252B - 2.334{A}^{2} - 4.119{B}^{2} - 0.214AB\ with\ respect\ to\ A：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 1.602A - 0.214BA - 2.334A^{2} - 4.119B^{2} + 5.252B + 29.49\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 1.602A - 0.214BA - 2.334A^{2} - 4.119B^{2} + 5.252B + 29.49\right)}{dA}\\=&1.602 - 0.214B - 2.334*2A + 0 + 0 + 0\\=& - 0.214B - 4.668A + 1.602\\ \end{split}\end{equation} \]

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