Find the exact value by using a half-angle identity.
tan(7pi/8)

Question

Find the exact value by using a half-angle identity.
 tan(7pi/8)

anonymous · Answer

-0.414213562373095048801688724209698078569671875376948073176679737990732478462107038850387534327641572735013846230912297024924836055850737212644121497099935831413222665927505592755799950501152782060571470109559971605970274534596862014728517418640889198609552329230484308714321450839762603627995251407989687253396546331808829640620615258352395054745750287759961729835575220337531857011354374603408498847160386

anonymous · Answer

what is this?

anonymous · Answer

=sin(7pi/4)/1+cos(7pi/4)
=(-1/radical 2)/(1+1/radical2)
=-1

anonymous · Answer

HAHAH mine is more exact :P

anonymous · Answer

hmm.. ya maybe

anonymous · Answer

thanks guys .

anonymous · Answer

I medal'd you solane. Yours was more like what they needed :P

anonymous · Answer

no prob :) and yahh i think u're answer was a bit too long..just saying :P

anonymous · Answer

Your right. :)

anonymous · Answer

what about this :-Rewrite with only sin x and cos x. 

sin 2x – cos 2x

anonymous · Answer

sin2x=2sinxcosx

anonymous · Answer

that's the double angle identity