Ask your own question, for FREE!
Mathematics 16 Online
OpenStudy (anonymous):

cos 165° this is sum and difference formula for trigonometry

OpenStudy (anonymous):

cos (120+45) or cos (a+b)

OpenStudy (anonymous):

ok

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!