Ask your own question, for FREE!
Mathematics 25 Online
OpenStudy (anonymous):

cos 36 cos 72 cos 108 cos 144= 1/16

OpenStudy (anonymous):

what to do?

OpenStudy (anonymous):

we have to prove it

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!