n^3＞2(n-1)^3+3
    x^<=0
    -x<=0
    x^2<=0
    x^2>0
    x^2>=0
    －πx/(√1－x∧2)≦－1.714798
    e∧x≦0.18
    e∧[－πx/√（1－x∧2）]≦0.18
    e（－πx/√（1－x∧2））≦0.18
    e(－πx/√1－x∧2)≦0.18
    -2-2x≥4
    n^2－2n－2016<0
    8/X<9/(X+1)
    5/X<6/(X+1)
    sqrt(a^2-a-2)-a<0
    -sqrt(a^2-a-2)-a>0
    sqrt(a^2-a-2)-a>0
    9x^2-6x+2>0
     -2x＾2-x-1/x＾2+2x-3 ≥0

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