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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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