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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1-a^2 <2a1+a^2 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1 - a ^ 2 <2 * a * 1 + a ^ 2         (1)
        2 * a * 1 + a ^ 2 >0         (2)

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    From inequality(1)：
         a < -1.366025 或  a ＞ 0.366025
    From inequality(2)：
         a < -2 或  a ＞ 0

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    From inequalities (1) and (2)
         a < -2 或  a ＞ 0.366025    (3)

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    The final solution set is :
         a < -2 或  a ＞ 0.366025

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