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

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

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    From inequality(1)：
         x < -14.137167 或  -10.995574 < x < -7.853982 或  -4.712389 < x < -1.570796 或  1.570796 < x < 4.712389 或  7.853982 < x < 10.995574 或  x ＞ 14.137167

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    The final solution set is :
         x < -14.137167 或  -10.995574 < x < -7.853982 或  -4.712389 < x < -1.570796 或  1.570796 < x < 4.712389 或  7.853982 < x < 10.995574 或  x ＞ 14.137167
    *Note: Radian.

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