sqrt(1/x)≥x
    sqrt(1/x)＞x
    sqrt(x+1)＜abs(x)
    -X+3≤-15
    sqrt(x+1)＞x
    X-6＞4-4X
    sqrt(x+1)＜x
    2^x≥x^2
    2*x≥x^2
    9X-3-4X+2≤1
    3x−6≤9
    2x-2<4x+12
    x+1≥x^2
    (e^x-e^(-x))/2＜0
    (e^x-e^(-x))/2≥0
    x/sqrt(1-x^2)≥0
    ln(x+sqrt(x^2+1))＜x
    ln(x+sqrt(x^2+1))＜0
    ln(x+sqrt(x^2+1))≥0
    sin(x)≥0

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