2/(2-sqrt(9)-2)=
    9*9^3/1
    32%-(0.32-7/10+0.32)
    arctan(1/3)
    arctan(1/3)
    arctan0.1967
    arctan(4/3)
    30+（10/3）
    65.85÷0.319504
    0.159752×2
    lg393700.787402
    lg350140
    lg3
    arctan5/8.66
    arctan5/8.66
    42/30÷7
    4/5÷6
    arctan220/110
    arctan220/110
    arctan(1/3)

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