tan(83/62500)
    0.156819*303
    0.08*0.44
    0.05*0.74*303
    0.72135*303
    (((0.97+0.815)*0.86)/2-(0.06*0.77）
    (((0.97+0.815)*0.86)/2)+(((0.815+0.74)*0.42)/2)
    (((806+740)*370)/2)-56991-80*440-740*50
    55*55*3.14*6
    ((815+806)*50)/2
    ((970+815)*860)/2-60*770
    6.36 + 1.44
    （7400000+53011335.52）/9500000
    sqrttanacos0
    sqrtacos2
    (1/cos(0.001676)-1)*6400000
    log(1/0,2)
    log(1/sin0,2)
    arccos(0.001676)
    e(1/sin0)

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