Posted by Kay on Thursday, September 13, 2007 at 12:34am.
tan(7pi/8) = tan(7pi/4/2)
hence
tan(7pi/8)=sin(7pi/4)/(1+cos(7pi/4))
sin(7pi/4)=-(root2)/2
cos(7pi/4)=(root2)/2
so
tan(7pi/8)= -(root2)/2/(1+(root2)/2)
and then tidy up.
Sorry about the expressions, not easy to do in text.
How do you tidy it up?
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