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) (Show Source): You can put this solution on YOUR website!
\ =\ \cos(x)\cos(y)\ -\ \sin(x)sin(y))
\ =\ \cos(x)\cos(y)\ +\ \sin(x)sin(y))
Make the substitutions in your LHS and collect like terms to derive your RHS.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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