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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality cos(x) <= 0.5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         cos ( x ) <= 0.5         (1)

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    From inequality(1)：
         x ≤ -13.613568 或  -11.519173 ≤ x ≤ -7.330383 或  -5.235988 ≤ x ≤ -1.047198 或  1.047198 ≤ x ≤ 5.235988 或  7.330383 ≤ x ≤ 11.519173 或  x ≥ 13.613568

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    The final solution set is :
         x ≤ -13.613568 或  -11.519173 ≤ x ≤ -7.330383 或  -5.235988 ≤ x ≤ -1.047198 或  1.047198 ≤ x ≤ 5.235988 或  7.330383 ≤ x ≤ 11.519173 或  x ≥ 13.613568
    *Note: Radian.

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