Mathematics
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    20^2+x^2-2*50*x*cos(180-arcsin((50*sin50)/x-50))>(x+15)^2
    x+3/5<2x-5/3-1
    3(x+3)<5(2x-5)-1
    3(x+3)<5(2x-5)-15
    2+x^2>0
    2+x^2>0
    -2<a∧2+2a-3<-1
    -2<a∧2+2a-3<-4
    -1<a∧2+2a-3<0 -3<a∧2-2a-3<-2 a>0
    x+2>3x-6
    x+2<3x-6
    x/2-3/2≥-2
    2-3x<3-x
    1/3x-1/2≤1
    2x+5-3<6-3x
    10(x+3)➗(x-3)<12
    x^2-3x+2>0
    (x^2-1)(x-1)>0
    2x^2+10x-12≥0
    16≤22-x/100×0.55≤20

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