arccos0.901
    (0.45*sqrt(0.45^2+1)*sqrt(25*0.45^2+1))/1000
    90-arctan5.8-arctan(5.8/0.2)
    90-arctan5.8-arctan(5.8/25)
    90-arctan5.8-arctan5.8
    210-3*6.5
    180-90-arctan2.9-arctan2.9
    2*14300*3.14*0.55*0.55*0.57*（sin0.942）^3/9.42
    300/20*60*60
    107133884933791910939817229518087671072356002^(1/2)/60234201907068928000 - 11273661741181787/68719476736000
    (2^(1/2)*11195181179133^(1/2))/131200000
    cos105
    cos110
    cos100
    cos80
    cos90
    cos100
    cos110
    cos170
    (-0.653677+1)^-0.653677

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