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

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

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    From inequality(1)：
         x < -14.660766 或  -10.471976 < x < -8.37758 或  -4.18879 < x < -2.094395 或  2.094395 < x < 4.18879 或  8.37758 < x < 10.471976 或  x ＞ 14.660766

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    The final solution set is :
         x < -14.660766 或  -10.471976 < x < -8.37758 或  -4.18879 < x < -2.094395 或  2.094395 < x < 4.18879 或  8.37758 < x < 10.471976 或  x ＞ 14.660766
    *Note: Radian.

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