1+1/2/2+2/2+3
    lg2+lg5
    123456/6546313
    13135435+5464531
    1400×[1+(5-1．5)％×3／12]
    （1-√3/3）/（1+√3/3）
    1-√9/1+√9
    2*1.026101＾5+2*1.026101＾4+2*1.026101＾3+2*1.026101＾2+2*1.026101＾1
    sqrt（e）
    arctan(1/(2*3^(1/2)-2)
    arctan((160*cos68-260*sin68)/(160*sin68+260*cos48))
    ((160sin68+260cos48)^2+(160cos68-260sin68)^2)^(1/2)
    arctan(2.3/1.6)
    arctan(3.9/(-2.2))
    arctan(2.9/3.6)
    arctan(-3/2.4)
    arctan((-7.5*3^(1/2)-8)/-7.5)
    arctan((7.5*3^(1/2)-8)/7.5)
    arctan(-2.5/7.7)
    arctan(2.95/6.8)

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