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Solve 9 4 6 In Exercises 9-20, find the exact value of each trigonometric expression without the use of a calculator. Note to instructors: The

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Solve 9

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4 6 In Exercises 9-20, find the exact value of each trigonometric expression without the use of a calculator. Note to instructors: The final answer to these exercise is fully simplified. TT TT 9. cos SbS 10. cos (30 + 450) SbS 11. cos SbS 12. cos (60 - 450)

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