Is the cosine an even or odd function?It is an even function. Remember y = (-2)2 = (-2)(-2) = 4 and y = 22 = (2)(2) = 4 The cos 460 = .69466 and the cos (-46)0 = .69466
If you rotate the graph around the y axis the image remains the same as it does with the parabola.
We say the graph is symmetrical to the y axis.
Is the cos a one to one function?
No because each y has 2 x values . For example a y value of .69466 can have an x value of either (-46)0 or (46)0
return