arctan8
    arctan4
    2.2883^2*sin2.2883
    2.2887^2*sin2.2887
    2.2885^2*sin2.2885
    2.288^2*sin2.288
    2.289^2*sin2.289
    2.291^2*sin2.291
    2.295^2*sin2.295
    2.29^2*sin2.29
    2.28^2*sin2.28
    2.29^2*sin2.29
    2.3^2*sin2.3
    2.32^2*sin2.32
    2.31^2*sin2.31
    2.33^2*sin2.33
    2.32^2sin2.32
    240/20*（22.47-20+1.27）-120*8%+3.75*（32-28.41）
    240/20*（22.47-20+1.27）-120*4%+3.75*（32-28.41）
    18*（22.47-20+1.272）-120*8%

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