Ask your own question, for FREE!
Trigonometry 27 Online
OpenStudy (anonymous):

find exact value. cos⁡〖7π/9〗 cos 2π/9-sin 7π/9 sin 2π/9

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!