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    Question

    If cos 2x = 1/2, then the value of

    x:
    A 15° Correct Answer Incorrect Answer
    B 30° Correct Answer Incorrect Answer
    C 45° Correct Answer Incorrect Answer
    D 60° Correct Answer Incorrect Answer

    Solution

    cos 2x = 1/2cos 2x = cos 60°2x = 60°x = 30°

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