### Integrate after Pullback

How to integrate a differential for obtained by pullback?

Let say I have calculated the pullback of some differential form, the result is (in latex):

```
$\rho^2\sin(\theta)\,\mathrm{d}\rho\wedge\mathrm{d}\theta\wedge\mathrm{d}\phi$
```

The triple integral is:

```
sage: integral(integral(integral(rho^2*sin(theta),rho,0,1),theta,0,pi/7),phi,0,pi/5)
```

But I want this process to be automatic, i.e. not manually write the integrand in the triple integral by myself. I want to be able to extract the integrand from the pullback and put it in the triple integral. I that possible?

Daniel