Here is an example of a cos wave consider x as theta (pi) y = cos x , function for cos wave plot data for x = [0, 45, 90, 180, 270, 360] for x =0 , y = cos 0 = 1 x =45 , y =cos 45 = 0.707 x= 90 , y = cos 90 = 0 x = 180 , y = cos 180 = -1 x = 270 , y = cos 270 = 0 x = 360 , y= cos 360 = 1 so what is the use of this wave , when datas take the cos wave pattern can be used to predict output for the inputs. To understand more use calculator with scientific mode and check for the input x on the graph and the corresponding y graph value which is a cos function it should match . Pattern are useful in machine learning problems ,for more check out the machine learning posts.
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