Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2cos(2x)-4sinx <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * cos ( 2 * x ) - 4 * sin x <0         (1)

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    From inequality(1)：
         x < -16.082698 或  -12.191636 < x < -9.799512 或  -5.908451 < x < -3.516327 或  0.374734 < x < 2.766858 或  6.65792 < x < 9.050044 或  x ＞ 12.941105

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    The final solution set is :
         x < -16.082698 或  -12.191636 < x < -9.799512 或  -5.908451 < x < -3.516327 或  0.374734 < x < 2.766858 或  6.65792 < x < 9.050044 或  x ＞ 12.941105
    *Note: Radian.

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