Ask your own question, for FREE!
Mathematics 20 Online
OpenStudy (courtstacks98):

Prove the identity: (cos x + cos y)^2 + (sin x + sin y)^2=2+2cos(x+y)

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!