### Simplifying numerator

I'm writing a script to create quotient rule exercises, but I cannot coerce the fraction to simplify as desired. In particular, I'd like `latex(sol)`

to look like the following:

` `~~\frac{2x^2+4}{(x^2+1)^2}
~~\frac{2x+4}{(x^2+1)^2}

But evaluating

```
(2*x+4)/(x^2+1)^2
```

always seems to factor the numerator to get

```
2*(x + 2)/(x^2 + 1)^2
```

and `simplify_full()`

seems to only expand the denominator, not the numerator:

```
2*(x + 2)/(x^4 + 2*x^2 + 1)
```