I removed all the method calls...the new answer can be converted to the old answer with `.expand(trig=True).expand()`

```
sqrt(2)*sin(a + pi/4)/2
>>> _.expand(trig=1)
sqrt(2)*(sqrt(2)*sin(a)/2 + sqrt(2)*cos(a)/2)/2
>>> _.expand()
sin(a)/2 + cos(a)/2
```