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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality cosx-20sin（10x） ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         cos x - 20 * sin ( 10 * x ) ≥0         (1)

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    From inequality(1)：
         -1.570796 ≤ x ≤ -1.255085 或  -0.945405 ≤ x ≤ -0.62426 或  -0.318909 ≤ x ≤ 0.005002 或  0.309395 ≤ x ≤ 0.632353 或  0.939527 ≤ x ≤ 1.258175

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    The final solution set is :
         -1.570796 ≤ x ≤ -1.255085 或  -0.945405 ≤ x ≤ -0.62426 或  -0.318909 ≤ x ≤ 0.005002 或  0.309395 ≤ x ≤ 0.632353 或  0.939527 ≤ x ≤ 1.258175
    *Note: Radian.

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