In Exercises 23-30, solve algebraically for exact solutions in the interval [0,2pi). Use your grapher only to support your algebraic
work.
24. cos 2x + sin x = 0
23. cos 2x + cos. x = 0
25. cos .x + cos 3.x = 0
26. sin x + sin 3x = 0
In Exercises 31-36, use half-angle identities to find an exact value
without a calculator.
31. sin 15°
32. tan 1950
33. cos 75°
34. sin (5/12)
36. cos (w/8)
35. tan (7/12)