Prove the identity cos x + cos y = 2cos(x+y/2) cos(x-y/2).

a. show that x+y/2+x-y/2=x

b....

Mathematics, 17.12.2019 05:31 xaxtusgod

# Prove the identity cos x + cos y = 2cos(x+y/2) cos(x-y/2).

a. show that x+y/2+x-y/2=x

b. find a similar expression using x+y/2 and x-y/2 that equals y.

c. use parts (a) and (b) to prove the identity.

Answers: 1

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