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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (x^2-1)^1009+x^2018+2*x^2-1 <= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( x ^ 2 - 1 ) ^ 1009 + x ^ 2018 + 2 * x ^ 2 - 1 <= 0         (1)

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    From inequality(1)：
         -1/√2 ≤ x ≤ 1/√2

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    The final solution set is :
         -1/√2 ≤ x ≤ 1/√2

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