After reading many related questions here about "Missing number, treated as zero", I still do not understand why the following example results in such an error message:

```
\documentclass[11pt]{article}
\usepackage{tikz}
\begin{document}
\begin{figure}
\begin{tikzpicture}
\clip(2.5,-1.5) rectangle (6,2);
\draw(4+{sin(0)}, {cos(0)}) circle(4pt);
\end{tikzpicture}
\end{figure}
\end{document}
```

## Best Answer

Change

`4+{sin(0)}`

to`{4+sin(0)}`

. The mathematics routines only apply to stuff inside curly brackets.