テスト のバックアップの現在との差分(No.2)


 #tex{{
 \nabla\cdot(f\bm{A})
 &= \left(\frac{\partial}{\partial x},\frac{\partial }{\partial y},\frac{\partial }{\partial z}\right)\cdot(fA_x,fA_y,fA_z)\\
 &= \left(\frac{\partial f}{\partial x}A_x+f\frac{\partial A_x}\left(\frac{\partial f}{\partial z}A_z+f\frac{\partial A_z}{\partial z}\right)\\
 &= \left(\frac{\partial f}{\partial x}A_x+\frac{\partial f}{x}+f\frac{\partial A_y}{\partial y}+f\frac{\partial A_z}{\partial z}\right)\\
 &= \left(\frac{\partial f}{\partial x},\frac{\partial f}{\partial y \frac{\partial }{\partial y},\frac{\partial }{\partial z}\right)\cdot(A_x,A_y,A_z)\\
 &=\nabla f\cdot\bm{A}+f\nabla\cdot\bm{A}
 }}
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