### Solving quadratic inequality

How to solve the following quadratic inequality:

$$0.3 < \frac{2x}{x^{2} + 4} <0.5$$

The call to `solve`

function return the following output:

```
sage:
sage: solve( [(2*x / (4+x**2)) < .5 , (2*x / (x**2 + 4)) > .3 ], x, to_poly_serve=True )
[[-2*x/(x^2 + 4) + 0.5 > 0, 2*x/(x^2 + 4) - 0.3 > 0]]
sage:
```

By hand calculation I found the following answer `(2/3, `

`$(2/3, 2) `~~U ~~ \cup (2, ~~6)~~

.6)$.