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    Question

    Find the general solution of cos 3x =

    1/2:
    A 2n╧А ┬▒ ╧А/9 Correct Answer Incorrect Answer
    B 2n╧А ┬▒ ╧А/3 Correct Answer Incorrect Answer
    C n╧А ┬▒ ╧А/9 Correct Answer Incorrect Answer
    D n╧А ┬▒ ╧А/6 Correct Answer Incorrect Answer

    Solution

    cos 3x = 1/2, cos ╧А/3 = ┬╜ so 3x = 2n╧А ┬▒ ╧А/3 Thus, x = 2n╧А/3 ┬▒ ╧А/9 Correct option: a

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