Double integral with polar coordinates

Evaluate the given integral by changing to polar coordinates.

http://www.webassign.net/latexImages...ad995c4eb7.gif

...where *D* is the region bounded by the semicircle http://www.webassign.net/latexImages...a5dd9384b0.gif and the *y*-axis.

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I do all my scrap work on a tablet, so here's what I came up with. I did all of the integration in WolframAlpha just to make sure it was correct (did it manually the first three times). What am I doing wrong?

http://mikederoche.com/temp/Untitled.png

Any help or hints would be appreciated!

Thanks.