cosx-2x＞0
    cosx-2x＞0
    (2x+3)/(3X-2)<1
    (x-2)/(x+1)>=0
    (x^2-9)/(x-2)>0
    1/5（x-100+4500/x）<=9
    x+4500/x＜=145x
    x+4500/x＜145x
    4800-80×√(60×60-x×x)＜0.5x×√（60×60-x×x）
    3x+5／x-1≧x
    1/(x×0.85)＜0.78
    1/(x×0.85)＜0.75
    3^x+2 -2 >=0
    sqrt(x)*lnx-x+1<0
    ((ln(1+1/x))^-2)*1/(x*(1+x))>0
    ((ln(1+1/x))^-2)*1/(x*(1+x))>1
    ((ln(1+1/x))^-2)*1/(x*(1+x))-1>0
    1/(x+1)-1/(x-1)>2/x*x
    1/(x+1)-1/(x-1)+2/x*x>0
    ln(x+1)-ln(x-1)>2/x

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