Prove the identity. sin(x - y) - sin(x + y) = -tan(y) cos(x + y) + cos(x - y) Use the Addition and Subtraction Formulas, and then simplify. 4 sin(x - y) - sin(x + y) cos(x + y) + cos(x - y) Read it 11 ) - (sin(x) cos(y) + cos(x) sin(y)) (cos(x) cos(y) – sin(x) sin(y)) + (cos(x) cos(y) + sin(x) sin(y)) 2 cos(x) cos(y) cos(y) Watch it

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