90+arctan(0.2*20.1)-arctan(0.2*20.1)-arctan(0.01*20.1)-arctan(0.0625*20.1)
    90+arctan(0.09*20.1)-arctan(0.2*20.1)-arctan(0.0144*20.1)-arctan(0.0625*20.1)
    90+arctan((0.09*20.1)^2+1)-arctan((0.2*20.1)^2+1)-arctan((0.0144*20.1)^2+1)-arctan((0.0625*20.1)^2+1)
    1/20.1/0.3
    90+arctan(0.12*17.13)-arctan(0.2*17.13)-arctan(0.012*17.13)-arctan(0.0625*17.13)
    40*sqrt((0.12*w)^2+1)=w*sqrt((0.2*w)^2+1)*sqrt((0.012*w)^2+1)*sqrt((0.0625*w)^2+1)
    40*sqrt((0.12*w)^2+1)=w*sqrt((0.2*w)^2+1)*sqrt((0.012*w)^2+1)*sqrt((0.065*w)^2+1)
    1/20/sqrt(0.12)
    arctan(0.15*18.76)+90-arctan(0.2*18.76)-arctan(0.02*18.76)-arctan(0.0625*18.76)
    arctan(0.15*18.72)+90-arctan(0.2*18.72)-arctan(0.02*18.72)-arctan(0.0625*18.72)
    0.15*0.127
    1/18.795/sqrt(0.127)
    （54000 - 5.7967X）÷45.5X=3.8%
    X+9=X×3-21
    X-9=(X-21)×3
    X+9=X÷3+21
    X+21=X÷3+9
    sin(x)/5900=sin(37-x)/3230
    1+2
    4y-4=y

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