In Exercises 19-24, a. Use the unit circle shown for Exercises 5–18 on the previous page to find the value of the trigonometric function. b. Use even and odd properties of trigonometric functions and your answer from part (a) to find the value of the same trigonometric function at the indicated real number. 19. а. соos 6. 20. а. соs 3 b. cos b. cos 21. a. sin 6 22. a. sin 3 b. sin(-) b. sin 23. a. tan 3 117 24. a. tan 6. 11m b. tan 3 b. tan 6

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