Ask your own question, for FREE!
Mathematics 11 Online
OpenStudy (anonymous):

Write the expression as either the sine, cosine, or tangent of a single angle. cos ( pi /5 ) cos( pi /7) + sin (pi / 5 ) sin(pi / 7)

OpenStudy (agent0smith):

Notice it looks like cosAcosB + sinAsinB. Compare this to the website link i gave.

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!