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Mathematics 9 Online
OpenStudy (anonymous):

Now is your chance to find examples of sinusoids. Come up with some examples of natural or man-made phenomena that repeat at predictable intervals. Search the Internet to find descriptions, and post the link as well as your analysis of why the behavior is periodic. You do not have to find an equation or write one. Examples already given in the lessons for this unit are off limits, so look for something new.

OpenStudy (dumbcow):

hmm how about the weather

OpenStudy (anonymous):

the hands on a clock

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