Please help me do section 6-3, page 364, exercises 20, 22, 24, 26, 28, 30, 32, 34, 36

Find each value by referring to the graph of the sine or the cosine function. 19. cos 87 20. sin 11a 21. cos 22. gin 23. sin 24. cos ( 3x) 25. What is the value of sin ~ + cos s? 26. Find the value of sin 2x - cos 2x. Find the values of o for which each equation is true. 27.cos # - -1 20. sino - 1 29. cos # - 0 30. Under what conditions does cos # - 1? Graph each function for the given interval. 31.) - sink, 5rex= -3x 32. y - COS X, AT EX = 101 33. y - COS X, -51 =19 -3x 34. y - sin >, 2 2 35 35.y = COS X, 2 2 36. y - sin x, 2 2