### Importing Sage functions into Cython?

I am playing around with Cython but I can't get it to work very well with Sage. As a very simple example of the problems I am having, the following code doesn't work. I know that the reason is that I need to import `numerical_integral()`

from Sage somehow, but I don't know exactly how to do that.

```
%cython
numerical_integral(x^2, 0,1)
```

(This is something that's been confusing me for a few days now. I'm not sure if there's something about how Cython is supposed to be used that I am not understanding properly.)

EDIT: after trying out some things, I realized that `sage.gsl.integration.numerical_integral()`

has the same effect as `numerical_integral()`

in Sage. So, somehow, I should import the function from `sage.gsl.integration`

, if that even makes any sense?