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Question: use one or more of the six sum and difference...

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Use one or more of the six sum and difference identities to find the exact value of the expression. Find the exact value for #13, 17, 21. Please and thank you!Use one or more of the six sum and difference identities to solve Exercises 13-54. In Exercises 13-24,find the exact value of each expression. 13. sin(45° - 30°) 15. sin 105° 17. cos (135 30) 14. sin(60° - 45°) 16. sin 75° 18. cos(240 45)19. cos 75° 20. cos 105° ππ 21. tan -+-- ππ 23. tanım-T ( --) 24. tan

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