Posted by latrice on Wednesday, September 23, 2009 at 2:37pm.
cos(-pi)=cos(pi)=-1
Note: cos(-x)=cos(x), cos is an even function
cos(6π)=cos(0)=1
Note: cos(x)=cos(x-2kπ) where k is an integer.
sin(x) = sqrt(1-cos²(x))
tan(x) = sin(x)/cos(x)
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