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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 230/cosx <375 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        230 / cos x <375         (1)

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    From inequality(1)：
         -7.193708 < x < -5.372663 或  -4.712389 < x < -1.570796 或  -0.910522 < x < 0.910522 或  1.570796 < x < 4.712389 或  5.372663 < x < 7.193708

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    The final solution set is :
         -7.193708 < x < -5.372663 或  -4.712389 < x < -1.570796 或  -0.910522 < x < 0.910522 或  1.570796 < x < 4.712389 或  5.372663 < x < 7.193708
    *Note: Radian.

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