Chapter 14.2, Problem 38E

Find $f_x,f_y,f_z$, and $f_{yz}$ for the given functions. In Exercises 35 and 36, also find $f_y\left(3,4,-2\right)$ and $f_{yz}\left(1,-1,0\right)$. (See Example 9.)

$f\left(x,y,z\right)=2y{e}^{7xz}$