Unit circle Cosine wave
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As You Can See From The Extended Sine And Cosine Graphs, Each Curve Repeats Itself Regularly. This Trait Is Called "Periodicity", Because There Is A "Period" Over Which The Curve Repeats Itself Over And Over. The Length Of The Period For The Sine And Cosine Curves Is Clearly 2Π: "Once Around" A Circle. Also, Each Of Sine And Cosine Vary Back And Forth Between –1 And +1. The Curves Go One Unit Above And Below Their Midlines (Here, The X-Axis). This Value Of "1" Is Called The "Amplitude". When You Graph, Don'T Try To Plot Loads Of Points. Note That The Cosine Is At Y = 1 When X = 0 And 2Π; At Y = 0 For X = Π/2 And 3Π/2, And At Y = –1 For X = Π. Plot These Five "Interesting" Points, And Then Fill In The Curve.
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