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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.

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# Help with a proof.

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