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Posted by Kay on Thursday, September 13, 2007 at 12:34am.

Use the half angle formula to find the exact value of tan 7 pie/8

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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