Hi, I've been looking at surface integrals, and I'm having a problem with all the exponential functions I come across. In a single variable case:

I would just take this as:

and then take the integral within the new limits given by du = 2dx.

An example of a question with exponentials in a surface integral that I'm stuck on is, evaluate:

How do I go about such a thing? I know how to do some basic surface integrals, with indicies/trig functions etc, over rectangular and non-rectangular domains BTW, but this exponential stuff has got me beat. Thanks

P.S. how can I get the brackets properly round the fraction with Latex? Thanks