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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality sin(0.1πt) ≤-0.2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         sin ( 0.1 * π * t ) ≤ -0.2         (1)

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    From inequality(1)：
         t ≤ -40.640942 或  -29.359058 ≤ t ≤ -20.640942 或  -9.359058 ≤ t ≤ -0.640942 或  10.640942 ≤ t ≤ 19.359058 或  30.640942 ≤ t ≤ 39.359058 或  t ≥ 50.640942

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    The final solution set is :
         t ≤ -40.640942 或  -29.359058 ≤ t ≤ -20.640942 或  -9.359058 ≤ t ≤ -0.640942 或  10.640942 ≤ t ≤ 19.359058 或  30.640942 ≤ t ≤ 39.359058 或  t ≥ 50.640942
    *Note: Radian.

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