SOLUTION: Verify the identity. cos (x - y) - cos (x + y) = 2 sin x sin y

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Question 698214: Verify the identity.
cos (x - y) - cos (x + y) = 2 sin x sin y
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!






Make the substitutions in your LHS and collect like terms to derive your RHS.

John

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