Test
是谁
\(a\times b\)
\[\mathbf{V}_1 \times \mathbf{V}_2 = \begin{vmatrix}
\mathbf{i} & \mathbf{j} & \mathbf{k} \\
\frac{\partial X}{\partial u} & \frac{\partial Y}{\partial u} & 0 \\
\frac{\partial X}{\partial v} & \frac{\partial Y}{\partial v} & 0 \\
\end{vmatrix}
{\tep1}{\style{visibility:hidden}{(x+1)(x+1)}}
\]
python
import torch
import torchvision
printf() 函数
