\[\frac{\partial(f,g,h)}{\partial(x,y,z)}=\begin{vmatrix}\ifrac{\partial f}{%
\partial x}&\ifrac{\partial f}{\partial y}&\ifrac{\partial f}{\partial z}\\
\ifrac{\partial g}{\partial x}&\ifrac{\partial g}{\partial y}&\ifrac{\partial g%
}{\partial z}\\
\ifrac{\partial h}{\partial x}&\ifrac{\partial h}{\partial y}&\ifrac{\partial h%
}{\partial z}\end{vmatrix},\]