Try switching the order of integration – 2012-10-25
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For some basic information about writing math at this site see e.g. [here](http://meta.math.stackexchange.com/questions/5020/), [here](http://meta.stackexchange.com/a/70559/155238), [here](http://meta.math.stackexchange.com/questions/1773/) and [here](http://math.stackexchange.com/editing-help#latex). – 2012-10-25
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@Ting, Have you tried anything that did not work? What specifically is the part where you are stuck? – 2012-10-25
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@Justin I'm actually not sure how to integrate the trigo functions. I've changed the order of integration, integrated it with respect to x, but got stuck at the integration with respect to y because of the trigo functions. – 2012-10-26