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

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

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    From inequality(1)：
         x ≤ -0.836069 或  x ≥ 0.836069
    From inequality(2)：
         x ＞ -1
    From inequality(3)：
         x < 1

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    From inequalities (1) and (2)
         -1 < x ≤ -0.836069 或  x ≥ 0.836069    (4)
    From inequalities (3) and (4)
         -1 < x ≤ -0.836069 或  0.836069 ≤ x < 1    (5)

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    The final solution set is :
         -1 < x ≤ -0.836069 或  0.836069 ≤ x < 1

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