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How do you find cos 8(pi) by referring to the graph of the sine or cosine function?

1 Answer

Oct 29, 2015

#cos(8pi)=1#

Explanation:

Since #8pi# is a multiple of the period of cosine function, you can write that:

#cos(8pi)=cos(0)#.

Now if we look at the graph of cosine function we see., that #cos(0)=1#. So finally we can write, that:

#cos(8pi)=cos(0)=1#

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