# How to get latex expression in exponential notation?

I need a latex representation of equations in exponential notation, e.g. units of J/K should be represented as:

```
J K^{-1}
```

Is there a way to force sage to return such a result? Here is an example:

```
var('J K ')
unit1 = J/K
latex(unit1)
```

returns:

```
\frac{J}{K}
```

I tried expand(), but it does not seem to expand fractions to their exponential representation.