60*24*3600
    arccos0.8969793198410943665971043101736073122118
    arccos0.850198085472964728429908393769995139466
    0.000000000000003*(8000/122.77)
    e^(-33.33)
    -(400)^2/(4*2*600)
    (4*3.14*2*600)^(0.5)
    arccos0.9072896551724137931034482758620689655172
    20000/2.5
    log(1.005,63200/(63200-58104))
    log(1.01,63200/(63200-58104)
    564.33*e^(-4/(4*0.0015*60))
    600/(4*3.14*0.0015*60)^(1/2)
    arccos0.8889189189189189189189189189189189189189
    atan1+acos0.5
    0.3334*0.509
    1-(1-0.491)/3*0.491
    0.44/0.589
    0.988-4*0.411/3
    0.137*3

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