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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality sinx <0     Question type: Inequality
    Solution:
    The inequality can be reduced to 3 inequalities：
         sin x <0         (1)
        0 < x         (2)
         x <3.14         (3)

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    From inequality(1)：
         -15.707963 < x < -12.566371 或  -9.424778 < x < -6.283185 或  -3.141593 < x < 0 或  3.141593 < x < 6.283185 或  9.424778 < x < 12.566371
    From inequality(2)：
         x ＞ 0
    From inequality(3)：
         x < 157/50

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    From inequalities (1) and (2)
         3.141593 < x < 6.283185 或  9.424778 < x < 12.566371     (4)
    From inequalities (3) and (4)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (5)

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    The final solution set is :
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!

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