(PDF ¥Õ¥¡¥¤¥ë: test2.pdf)

[1](b)

$BNc$($P(B

$$\begin{eqnarray*} && \nabla\cdot\mbox{\boldmath$A$} = \frac{\partial A_x}{\p... ...z}\right) \\ && \frac{\partial}{\partial x}(xy-2z^2) = y-2z^2 \end{eqnarray*}$$

$B$J$I!#(B