arctan(0.0284/-0.0114)*180/3.1415
    arctan(0.0137/-0.055)*180/3.1415
    arctan(0.1389/-0.0556)*180/3.1415
    arctan(0.0774/-0.0309)*180/3.1415
    arctan(0.03/-0.012)
    arctan(0.0137/-0.0055)
    1-e-3
    0.25*20%+0.5*11%+0.25*3%
    2.4+5*- 13.4
    99e-e2-25*49
    60*30%=
    16289.59/172774.74= -163986.11/8831.21
    -163986.11/490030.04
    16289.59/470928.55
    -159769.13/145137.17
    10987.20/202546.47
    -163987.11/145137.17
    116289.59/202546.47
    ((abs((exp(-50) - 1) / (exp(-50) + 1)) / 2) + 0.5)
    ((abs((exp(-30) - 1) / (exp(-30) + 1)) / 2) + 0.5)

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