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      Question

      Find the general solution of cos 3x =

      1/2:
      A 2nπ ± π/9 Correct Answer Incorrect Answer
      B 2nπ ± π/3 Correct Answer Incorrect Answer
      C nπ ± π/9 Correct Answer Incorrect Answer
      D nπ ± π/6 Correct Answer Incorrect Answer

      Solution

      cos 3x = 1/2, cos π/3 = ½ so 3x = 2nπ ± π/3 Thus, x = 2nπ/3 ± π/9 Correct option: a

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