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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 241/cosx ≤500*0.75 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        241 / cos x ≤500 * 0.75         (1)

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    From inequality(1)：
         -7.156008 ≤ x ≤ -5.410363 或  -4.712389 ≤ x ≤ -1.570796 或  -0.872822 ≤ x ≤ 0.872822 或  1.570796 ≤ x ≤ 4.712389 或  5.410363 ≤ x ≤ 7.156008

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    The final solution set is :
         -7.156008 ≤ x ≤ -5.410363 或  -4.712389 ≤ x ≤ -1.570796 或  -0.872822 ≤ x ≤ 0.872822 或  1.570796 ≤ x ≤ 4.712389 或  5.410363 ≤ x ≤ 7.156008
    *Note: Radian.

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