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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -0.05     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -0.05 < sin ( 6.283 * 20000 * t )         (1)
         sin ( 6.283 * 20000 * t ) <0.05         (2)

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    From inequality(1)：
         -0.155855 < t < -0.074527 或  0.083978 < t < 0.098753
    From inequality(2)：
         t < -0.394237 或  -0.394237 < t < -0.312909 或  0.162605 < t < 0.17738 或  0.17738 < t < 0.258708 或  t ＞ 0.258708

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    From inequalities (1) and (2)
            (3)

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    The final solution set is :
        
    *Note: Radian.

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