Mathematics
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    3.2*(1+20%)/(1+2.2%)
    arctan(2/3)
    arcsin0.5728
    sin21
    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))

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