Mathematics
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    cosx<0.9
    <(√2)π/4>x∧2=cos(πx+3π/2)
    m^2-8m+7<0
    m^2-5m+6>0
    m^2-8m+6>0
    m^2-8m+15>0
    2x+3>=0
    2160+80x>1920+0.8x
    22+208-162-10-25-18-18×6%÷12-120×9%÷12+a-a×6%÷12≧20
    5x-x^2>0
    -3/4x+2<-10
    3-5x<20-7x
    14-6x ≥ 7+x
    x^2-4x+4>0
    log(10,x) > -80.59
    !(x)>1000
    -80+x-x*20%>50
    -80+x-x*20%>132.65
    (2x+1)/(x-3)>-1
    -1/2a>-1

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