24+152exp(-25*0.0278)=
    arctan(600/450)
    arccos(600/860)
    arccos(500/860)
    arccos(360/860)
    arctan(600/320)
    2e2+e-15
    √(1/(√3))
    （3^1/2）^1/2
    lne2+1/lne2
    lne(1/2)+1/lne(1/2)
    lne1/2+1/lne1/2
    ln2+1/ln2
    5191232000/7088909000
    log(2,27)
    acos0.5
    arccos(-6.48/8.64)
    arccos(6.48/8.64)
    arctan(3/2)
    16000*8000

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