sin21
    arcsin（5/8）
    arcsin5/8
    sin30
    sin30
    1/9*5.4
    12/44*8.8
    sin（arctan4+arctan0.25）=
    （sin1）（sin1）-2sin1
    sin1
    lg(1.0*10＾3/2.8/10＾-8)
    sin1/1
    140*（1.05-1.1）=
    10000000*（0.12-0.07）=
    (0.153*2.53-3.1308+sqrt((3.1308-0.153*2.53)^2-0.2044*(0.31257-0.167*2.53)))/0.1022
    0.153*2.53-3.1308+sqrt((3.1308-0.153*2.53)^2-0.2044*(0.31257-0.167*2.53))
    2^log(2，7)
    log(2，65536)
    log(3,27)
    sqrt(9)

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