2arctan(0.2/86)=
    arctan(2/86)=
     2arctan(2.5/86)
     2arctan(2.5/85)
     2arctan(2.5/80)
    2arctan(2.5/90)
    2arctan(3.03/100)
    2arctan(3.33/100)
    arctan1-arccos1
    arctan-1-arccos-1
    arctan-1-arccos-1
    arctan-1-arccos-1
    2arctan(3.33/80)=
    2arctan(3.075/60)
    2arctan(3.075/70)
    2arctan(3.33/70)
    1.2×104.5×0.5×0.6
    2arctan(3.73/70)=
    2arctan(4/60)=
    e

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