$F=-\nabla U$
$F=-(\frac{\partial U}{\partial x}$$\hat{x}$+$\frac{\partial U}{\partial y}$$\hat{y}$+$\frac{\partial U}{\partial z}$$\hat{z} )$
$F=-\left((2x-yz)\hat{x}+(2y-xz\hat{)y}+(2z-xy)\hat{z}\right)$
$F=-1\hat{x}-1\hat{y}-1\hat{z}$
olarak bulunur.