Can anyone help me with this online assignment? I have went through the first part but the 2nd part seem pretty confusing. Can anyone give me tips as to how to start it? I have to select right answers.

http://img25.imageshack.us/img25/9213/diffculty.jpg

THANKS!

EDIT: the "N" stands for pi.

how come the answer come up as sin to the power of (2pi/4)? sin^...

You can not have sin, cos to the power of something.. or did i interpret it wrong again? thanks!