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Mathematics 15 Online
OpenStudy (anonymous):

Find the length of the curve traced out by r. r(t)=(sin(t)^3)i+(cos(t)^3)k for t in [-pi,-.5pi]

OpenStudy (anonymous):

|dw:1346612077532:dw| \[ds^2=di^2+dk^2\] \[ds=\sqrt{di^2+dk^2}\] http://www.youtube.com/watch?v=_60sKaoRmhU&feature=edu&list=PL19E79A0638C8D449 first- best explanation I have come across

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