Mathematics
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    x^2cosx-3sinx大于等于tanx
     x ^ 2 - 3 * x ≥ 0
    √(x²-3x)<0
    √(x²-3x)>=0
    xx-cos(x)>sin(x)^2
    xx+cos(x)>sin(x)
    xx+9<4x
    (5+2x)(3-x)<0
    -2x^2+72x+320>870
    -2a(2a+1)<0
    (x^2-2x)^2+(x-2)(4-x)<0
    x^4+4x^3+4x^2+x^2-2x<0
    (2x-1.5)²-4x×5.5<0
    200(x-10)^2+66000<=540000
    3-3X^2 <0
    3-3X^2>0
    log(2,3-x)≦3
    abs(2x+3>13
    15-absx>5
    abs(1/2x-3)>=1

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