Prove the identity sin (a+ B) + sin (a-B) = 2 sina cos ß. To verify the identity, start with the left side and transform it to look like the right side. Choose the correct transformations and transform the expression at each step. sin (a+ B) + sin (a-B) = sin a cos B+ cos a sin B + sin a cos B- cos a sin ßUse sum and difference identities. Combine like terms. = 2 sin a cos f

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