x^2-9.1x+19.1=0
    x^3-x^2-x-2=0
    84.1= 36.448ln(x) - 6.9836
    50 = 36.448ln(x) - 6.9836
    x-1025=0.13*19.555*x^(2/3)
    1.455*x^(2/3)=x-950
    1.455*x^(2/3)=x-1025
    x-1.22*x^(2/3)=1025
    65x^2-624x+832=0
    arctan(0.4*x)-90-arctan(0.2*x)-arctan(0.5*x)-arctan(0.08*x)=-180
    arctan(0.4*x)-90-arctan(0.2*x)-arctan(0.5*x)-arctan(0.08*x)=180
    6*sqrt((0.4x)^2+1)/(x*sqrt((0.2x)^2+1)*sqrt((0.5x)^2+1)*sqrt((0.008x)^2+1))=1
    6*sqrt((0.4x)^2+1)/(x*sqrt(0.04*10+1)*sqrt(0.25*10+1)sqrt((0.008x)^2+1))=1
    12/(x*sqrt(0.04*10+1)*sqrt(0.25*10+1)sqrt((0.008x)^2+1))=1
    6/(x*sqrt(0.04*10+1)*sqrt(0.25*10+1))
    90-arctan(0.2*x)-arctan(0.5*x)=-180
    90-arctan(0.2*x)-arctan(0.5*x)=180
    6/(x*sqrt(0.04x^2+1)*sqrt((0.5x)^2+1))=1
    180-90-arctan(0.2*x)-arctan(0.5*x)=-180
    x*sqrt((0.2x)^2+1)*sqrt((0.5x)^2+1)=12

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