1. The problem statement, all variables and given/known data Hi. I have been given the following question. Show that this is true: 2. Relevant equations 3. The attempt at a solution Well I drew out the region and the bounds. I'm pretty sure that it isn't possible to integrate this because no matter the order, I need either an x or a y in there to do a substitution. So I'm guessing that I just have to show in some way that the final integral solution will lie between those two numbers, but I don't know how to approach this.