show() smashes multiplied numbers together so the product looks like a number

[jason]

To see this, evaluate the following in a notebook cell:

var('r,z')
a=(r*z^2).integrate(z,0,r).integrate(r,0,sqrt(9/2))*2*pi
a.show()
print a

Firefox 3 Beta 5; Ubuntu 8.04

[dmharvey]

duplicate of #3202