400^4
    10^-8
    (ln(1416.24/262))^(-1)
    【2（√5－1）】÷（√5＋1）
    2（√5－1）
    2/3*1*14.3*3.1415926*400^3*（sin（180*0.2288））^3/3.1415926+360*7959*332*（sin0.2288*180+sin0.7924*180）/3.1415926
    2/3*1*14.3*3.1415926*400^3*（sin（180*0.2436））^3/3.1415926
    1 2 3 4 5 6 7 9 0 1 2 3 4 5 6 7 9 × 8 1
    2/3*1*14.3*π*400^3*（sin（180*0.2436））^3/π
    （sin（0.2288π））^3
    （sin0.2288π）^3
    sin0.2288π
    2/3*1*14.3*3.1415926*400*400*400*（sin0.2288π）^3/3.1415926+360*7959*332*（sin0.2288π+sin0.7924π）/3.1415926
    atan[2-1/(2*√(3))]
    arctan(1.6/28)
    arctan4.2857
    50*30%
    17.8-5.06
    3.6*5
    242+48

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