SOLUTION: Prove that sin(x+y)=2cos(x+y)/2+cos(x+y)/2

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Question 1010654: Prove that sin(x+y)=2cos(x+y)/2+cos(x+y)/2
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
That isn't an identity.  It cannot be proven because it is
not generally true.  You must have copied it wrong.