39-42 - Using Addition or Subtraction Formulas Use an Addi- tion or Subtraction Formula to simplify the equation. Then find all solutions in the interval [0, 27). 39. cos 0 cos 30 – sin 0 sin 30 = 0 40. cos e cos 20 + sin 0 sin 20 = ! 41. sin 20 cos 0 – cos 20 sin 0 = V3/2 42. sin 30 cos 0 - cos 30 sin e = 0

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