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
    12/(x*sqrt(0.04x^2+1)*sqrt((0.5x)^2+1))=1
    8*13*x^2=13^2*x^2-48*13*x+24^2+32*8
    -25/9*x^2+5/18*x-6=0
    2/5+x=0
    -25/9x^2+5/18x-6=0
    1.6x=5.6
    84.1 = 37.078ln(x) - 7.7973
    50 = 37.078ln(x) - 7.7973

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