Mathematics
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    90-arctan0.2-arctan(1/4*0.2)+arctan10-arctan500
    0.2/11
    arctan0.48
    arctan2.89
    9.8/9.8/3.1/0.8
    9.8/(9.8/3.1/0.8)
    arctan(1/4)
    π/2-arctan4
    1.12^0.5
    12000*16.3%/12*9+12000
    12000*(1+16.3%)*9/12
    ln9
    ln(1+2√2)
    2000*7%/{(1+7%)^3-1}
    1.07^3
    1.7^3
    1.05^3
    1.16^0.5
    1.12^0.5
    3/1+0.15+3(1+8%)/(1+15%)^2+3(1+8%)^2/(1+15%)^3+20/(1+15%)^3

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