Ask your own question, for FREE!
Mathematics 7 Online
OpenStudy (anonymous):

use the half-angle formula to find the exact value of the expression Cos (3pi/8)

OpenStudy (solomonzelman):

you can plug the numbers into the formula....

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!