arctan0.26w-arctan0.2w-arctan0.05w-arctan0.14w=-3.14/2
    arctan0.26w-arctan0.2w-arctan0.05w-arctan0.14w=-π/2
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan(0.255w)-90-arctan(0.13w)-arctan(0.2w)-arctan(0.05w)=-180
    arctan 0.255w-90-arctan 0.13w-arctan 0.2w-arctan 0.05w=-180
    w×w×(1+0.2w×0.2w)×(1+0.05w×0.05w)＝36
     x*x(1+0.04x*x)(1+0.0025x*x) = 67.57
    x*x(1+0.04x*x)(1+0.0025x*x)=69.23

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