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    Question

    If 4cos2x - 3 = 0, and (0° > x > 90°),

    then find the value of 'x'.
    A 45° Correct Answer Incorrect Answer
    B 60° Correct Answer Incorrect Answer
    C 30° Correct Answer Incorrect Answer
    D 90° Correct Answer Incorrect Answer

    Solution

    Given, 4cos2x - 3 = 0

    Or, 4cos2x = 3

    So, cos2x = (3/4)

    Or, cosx = (√3/2)

    Or, cosx = cos 30o

    So, x = 30o

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