90-arctanx=56.9
    10.9x^2-50.57x-337.47=40.34
    10.9x^2-50.57x-337.47=818.72
    4sqrt((15.16x)^2+1)=x*sqrt(4x^2+1)*sqrt((57x)^2+1)
    4x=0.65sqrt(4*0.65^2+1)
    4x=xsqrt(4x^2+1)
    4sqrt((7.714x)^2+1)=x*sqrt(4x^2+1)*sqrt((29x)^2+1)
    0.266x*0.65=10
    sqrt((7.714x)^2+1)=x*sqrt(4x^2+1)*sqrt((29x)^2+1)
    0.266*x*0.65=5
    4x=0.65*sqrt(4*0.65^2+1)
    90-arctan(x)=56.9
    4*sqrt((13.86x)^2+1)=x*sqrt(4x^2+1)*sqrt(1600x^2+1)
    5=0.11*x*0.36
    4x=0.36*sqrt(4*0.36^2+1)
    90-arctanx=70
    0.22*x*0.577=10
    0.22*x*0.577=8
    4*sqrt((17x)^2+1)=x*sqrt(4x^2+1)*sqrt((78x)^2+1)
    0.22*0.577*x=10

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