# simplify not working correctly with conjugate?

In my notebook environment when I do this :

```
var('v','a')
t=(I*a/2)*(v-conjugate(v))
(t**3).expand()
```

It gives me the correct result. However when I do :

```
(t**3).expand().simplify()
```

The answer I get is zero. Is this a bug, or is there something I don't understand about the simplify function? Additionally: Is there another, better way to simplify expressions with many conjugates?