（1+10.43%）^2/（1+8.7%）-1=
    2arctan(0.04/100)
    2arctan(0.0004)
    2arctan(0 0004)
    2arctan(0.04/100)
    2arctan(0.04/100)
    4-3*(100-88.6)^2/1600
    4-3*(100-86.5)^2/1600
    4-3*(100-93.5)^2/1600
    4-3*(100-89.4)^2/1600
    4-3*(100-88.8)^2/1600
    4-3*(100-95)^2/1600
    4-3*(100-92)^2/1600
    4-3*(100-85)^2/1600
    4-3*(100-87)^2/1600
    4-3*(100-91.6)^2/1600
    4-3*(100-84.4)^2/1600
    4-3*(100-90)^2/1600
    4-3*(100-87.8)^2/1600
    4-3*(100-94)^2/1600

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