Question: 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

Use a sum/difference formula to evaluate. 7. cos 2550 8. sin

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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