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)
    ln(1/sin0)
    lntan90
    tan(0.001676)-0.001676
    sqrttan90
    1/(1-cos1)
    1/ln1
    1500*360
    35*12 +(25+95)*(12-3)

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