### Can I add mathematical formulas to a plot?

I know that using

```
text("Sage is really neat!!",(1,2))
```

one can easily add text to a plot in Sage. But searching the documentation I couldn't find a way to add a formula, say $\frac{1}{\sqrt{x^2-1}}$.

So is there a way to add a formula to a plot?

Ideally using LaTeX to enter the formula.