1 | initial version |

Given the Sage object `h`

you can see which methods apply to it, with the tab completion:

```
sage: h.<TAB>
```

You will see that there is an `expression`

method:

```
sage: h.expression()
(-t + 1, sqrt(-t^2 + 2*t))
```

This is a tuple, and you can get its entrie as follows:

```
sage: h.expression()[0]
-t + 1
sage: h.expression()[1]
sqrt(-t^2 + 2*t)
```

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