Find the length of the curve defined by http://hosted.webwork.rochester.edu/...6934f23841.png from http://hosted.webwork.rochester.edu/...4e4e3fa271.png to http://hosted.webwork.rochester.edu/...655a5ac7d1.png.

Ok so first I know that we have to take the derivative which is Attachment 13472 And What would I do from then?