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11. Write the trigonometric expression as an algebraic expression: sin(cos (2x) + sin 1 4x)Use a sum/difference formula to evaluate. 7. cos 2550 8. sin

11. Write the trigonometric expression as an algebraic expression: sin(cos (2x) + sin 1 4x)Use a sum/difference formula to evaluate. 7. cos 2550 8. sin 210' 9. Use a sum/difference formula to verify the identity. Show all steps: cos + x= - sin x

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