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Hi. I'm having trouble completing this homework problem.. any help would be greatly appreciated! Find the length of the parabolic segment r =2/(1-cos?) , ?/2 ? ? ? ? . I know I need to calculate r[sup:29elfnaf]2[/sup:29elfnaf], and (dr/d?)[sup:29elfnaf]2[/sup:29elfnaf], but once I do that...