Finding the equation of a periodic function from a graph or sketch

In this video we apply the standard equation of a periodic function to finding the equation from a sketch or graph. This particular example uses a cosine graph but is equally applicable to a sine graph. We cover amplitude, period, phase shift or horizontal shift as well as vertical shift. Want more videos? I've mapped hundreds of my videos to the Australian senior  curriculum at my website http://mathsvideosaustralia.com/

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