This is the code I have:

```
\begin{align}
\vec{l} \cdot \vec{n} & = \left \langle 1,2,3 \right \rangle$ \cdot \left \langle 3,-3,1 \right \rangle \\
& = 3 - 6 + 3 \\
& = 0 \\
\end{align}
```

Now for some reason, I keep getting this message:

```
"Missing } inserted <inserted text> } \end{align}"
```

I clearly have completed my `}`

.

## Best Answer

You have

`\rangle$`

; simply delete the dollar sign. In your example, you don't really need`\left`

and`\right`

, so you can just say: