sympy/sympy — pull request #7493 by smichr (2014-05-13 14:32:01+00:00)
Title: 7450: add evalf method for atan2

fixes #7450

```
>>> integrate(exp(-(1+I)*x), (x, 0, oo))
sqrt(2)*exp(-I*pi/4)/2
>>> nsimplify(_)
1/2 - I/2
```

That matches wolframalpha output.