（916,166,195+498,992,042+706,413,177）/4227272926
    arctan(244.346/0.693)
    arctan(0.693/244.346)
    arctan0.693/244.346
    log(3,4095)
    -0.0014*6.108480^2 - 0.0805*6.108480 + 12.011=
    10^(3/10)
    0.2661*5.818325^2 + 0.1355*5.818325 + 0.7102
     0.0139*5.818325^2 - 0.4188*5.818325 + 12.473=
    10-0.5e100
    e^（1/e）
    arctan1.86
    arctan1.86
    100*10%
    8^3=
    8*3=
    arctan-1
    (0.078818-0.0768)/(12-1)/0.078818-2*0.002
    (0.099-0.0768)/(12-1)/0.099-2*0.002
    [(0.099/0.0768)/(20-1)/0.099-2*0.002

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