There are 1 questions in this calculation: for each question, the 1 derivative of a is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ sqrt({a}^{2} + {b}^{2})n + sqrt({c}^{2} + {d}^{2})m\ with\ respect\ to\ a：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = nsqrt(a^{2} + b^{2}) + msqrt(c^{2} + d^{2})\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( nsqrt(a^{2} + b^{2}) + msqrt(c^{2} + d^{2})\right)}{da}\\=&\frac{n(2a + 0)*\frac{1}{2}}{(a^{2} + b^{2})^{\frac{1}{2}}} + \frac{m(0 + 0)*\frac{1}{2}}{(c^{2} + d^{2})^{\frac{1}{2}}}\\=&\frac{na}{(a^{2} + b^{2})^{\frac{1}{2}}}\\ \end{split}\end{equation} \]

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