I have the following question: I like to have a big curly brace behind the equations to show that they belong together and have only one equation number.

An example without the brace would be

```
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
\begin{split}
x &= r\,\cos \varphi\\
y &= r\,\sin \varphi
\end{split}
\end{align}
\end{document}
```

I would like to have the curly bracket behind the two equations. I saw this already in textbooks but have not found latex code for that. I guess it is very simple, but at the moment I have no clue how to do it. I was already searching for a while.

## Best Answer

You could use the following, modified version of the code you've provided:

By the way, both the

`align`

and`split`

environments, which you employ in your code, let users set alignment points (e.g., the equal sign) with the`&`

symbol. Using both environments simultaneously is redundant.Note that I've substituted

`equation`

for`align`

, and`aligned`

for`split`

, in the code above because you mention that you want the equations to be associated with asingleequation number. (The`align`

environment will create separate equation numbers for each equation it encounters unless you use the`\notag`

command, but this seems more complicated than using the`aligned`

environment inside an`equation`

environment.)