cosx≥-sqrt(3)/2
    1<=sqrt(x^2+(2*x-3)^2)<=3
    1<=sqrt(x^2+4*x+9-12*x)<=3
    1<=x^2+4*x+9-12*x<=9
    abs(x)<1
    abs(2x+3)>1
    x^2-x-30<0
    (x^2+6)/2>11/5
    7x-3<=9
    6x^2-3x+7<0
    10*x+5*(800-x)≥4800
    10x+5*(20-x)>90
    abs(x-3)<=1
    abs(x-1)<=1
    abs(7x-9)>=-8
    4x^2-19x-5<=0
    3x^2+5x-28<0
    (7411500+382*x-2600000)/sqrt((1274778^2+(25.632*x)^2+45844000000) ) > 3.7
    2/(1-x)-1>0
    m^2>4

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