# numerically integrating an expression containing 'i'

This is example of an integral that can't be evaluated using

```
sage: numerical_integral(i*sin(i*x), x, 0, 0.2)
Traceback (click to the left of this block for traceback)
...
TypeError: unable to coerce to a real number
```

even though the integrand is real (in disguse). How can I get around this problem?