4+2*5.656*(1+1.034^2)^(1/2)
    4+2*7.714*(1+1.034^2)^(1/2)
    (1.05*(36.138^2/9.81))^(1/3)
    [1.05*(38.044^2/9.81)]^(1/3)
    77^2
    9^9
    6^7
    6^777
    7＾9999
    8/9-(8/9-9/25)
    arctan(20/9)
    arctan20/9
    1/21/3
     1800/2.7*2.4=
    1800/2.7*1.4
    1177/2.7*1.4
    arccos0.395
    arccos0.395
    999999^2
    99999^2

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