 , 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.   ### Another question on Mathematics Mathematics, 21.06.2019 15:00
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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....
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