Griffith, Ex. 2.7

I'm checking out this integral.
$\mathrm{int}\left(\frac{\left(z-R\cdot u\right)}{{\left(z^2+R^2-2\cdot z\cdot R\cdot u\right)}^{\frac{3}{2}}},u\right);<br><br>$

The solution (without inserting values) is computed with Maple.
$-\frac{R-zu}{z^2\sqrt{z^2+R^2-2zRu}}$
The question would be now, how to get the integral from x=-1 to x=1. I need to tell Maple that z > R. How can I do that?
One a side note, it seems as if I can not view the MathML in Safari. Why is that?