Mathematics
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    【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
    18832391713747645951035781544256120527306967984934086629/3191
    18832391713747645951035781544256120527306967984934086629/154083204930662557781201849
    1111111111111111111111111111111111111111111111111111111111/59
    1111111111111111111111111111111111111111111111111111111111/9090909090909090909090909091
    -90-arctan7.436-arctan(0.2*7.436)=
    11%
    5^1985
    999999999*999

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