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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality ln(1+x^2)+2x/(1+x^2) <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ln ( 1 + x ^ 2 ) + 2 * x / ( 1 + x ^ 2 ) <0         (1)
        From the definition field of ln
         1 + x ^ 2 > 0        (2 )
        From the definition field of divisor
         1 + x ^ 2 ≠ 0        (3 )

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    From inequality(1)：
         -1.280097 < x < 0
    From inequality(2)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(3)：
         x ∈ R （R为全体实数），即在实数范围内，不等式恒成立！

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    From inequalities (1) and (2)
         -1.280097 < x < 0     (4)
    From inequalities (3) and (4)
         -1.280097 < x < 0     (5)

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    The final solution set is :
         -1.280097 < x < 0

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