Fix latex

chapters/en/unit8/terminologies/linear-algebra.mdx

@@ -137,7 +137,7 @@ Rotations around an axis are another commonly used transformation. There are a n
 
 - Rotation around the X-axis
 
-  $$ R_x(\alpha) = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & \cos\alpha & -\sin\alpha & 0 \\ 0 & \sin\alpha & \cos\alpha & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix} $$
+    $$ R_x(\alpha) = \begin{pmatrix} 1 & 0 & 0 & 0 \\ 0 & \cos\\alpha & -\sin\\alpha & 0 \\ 0 & \sin\\alpha & \cos\\alpha & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix} $$
 
 A little example for a positive 20 degree roation around the X-axis is given below:
 
@@ -178,7 +178,7 @@ We are sure you can use the example snippet above and figure out how to implemen
 
 - Rotation around the Z-axis
 
-  $$ R_z(\gamma) = \begin{pmatrix} \cos\gamma & -\sin\gamma & 0 & 0 \\ \sin\gamma & \cos\gamma & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix} $$
+    $$ R_y(\beta) = \begin{pmatrix} \cos\\beta & 0 & \sin\\beta & 0 \\ 0 & 1 & 0 & 0 \\ -\sin\\beta & 0 & \cos\\beta & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix} $$
 
 Again, can you use the last code snippet and implement a rotation around the Z-axis❓
 
@@ -207,4 +207,4 @@ plot_cube(ax, final_result, label="Combined", color="violet")
 
 The output should look something like the following.
 
-![output_rotation](https://huggingface.co/datasets/hf-vision/course-assets/resolve/main/combined.png)
+![output_rotation](https://huggingface.co/datasets/hf-vision/course-assets/resolve/main/combined.png)