Thread: Cosine function
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boombaby
#11
Dec23-08, 11:05 PM
P: 130
...I think it is necessary to know the graph of cos(x), which may help a lot. so, find one.

edit ( trying not to be ambiguous)
...I think it is necessary for one to know the graph of cos(x), which may also help a lot. (regardless of this particular problem)...
"periodic" is really the key