Verify the product-to-sum identities below using the sine sum and difference identities. sin x . cosy = > [ sin (x + y) + sin (x -y)] (1) 1 - cos x . sin y = , [ sin (x + y) - sin (x -y)] (2) Begin with the right side of identity (1). Rewrite this expression using the sine sum and difference identities. +()] (List the terms in the same order as they appear in the original list.)