Ask your own question, for FREE!
Trigonometry 13 Online
OpenStudy (anonymous):

cos(theta+phi)cos(theta-phi)=cos^2 theta-sin^2 phi can anyone can prove this i will give medal and i will be your fan

OpenStudy (anonymous):

@CaseyCarns

OpenStudy (anonymous):

@xapproachesinfinity

OpenStudy (anonymous):

@Hero

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!