Mathematics
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    1/tan90
    log(tan90,sin90)
    ln!(20)
    lnC(20,9)
    A(tan90,3)
    128√e980
    2280.63894556^2
    A(-4,3)
    【0.05sin(3π/4)+0.06sin(π/4)】/【0.05cos(3π/4)-0.06cos(π/4)】
    sin(3π/4)
    (0.05+0.06)/(0.06-0.05)
    (0.05+0.06)/0.06-0.05
    arctan2.5
    arctan11
    exp(-0.1)
    arctan1/0.628=
    89.3+89.3/0.68*0.32
    350*(1-6%)*(1-15%)
    352068305247334074689830508478096954238914018713/43037
    5901721000861061094025628813618339243906915695686019/16763

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