5878288762.64-5305541098.92
    780743893.31-761621258.44
    2.736/0.632
    806766396.66-780743893.31
    86766396.66-780743893.31
    180-90-arctan(0.623)-arctan(0.2*0.623)-arctan(102.89*0.623)+arctan(16.05*0.623)
    1/0.1/0.623/0.156
    180-90-arctan(2)-arctan(0.2*2)
    2965550178.74-2706217465.90
    -90-arctan3.76-arctan0.376-arctan1.88
    sqrt35
    20-20lg2-10lg2
    20-20*lg2-10*lg2
    20-20lg2-20lg(sqrt(2))
    855/57 996/83
    465/40 796/25 327/45
    6^2+5^2
    8^2+5^2
    (0-9/2-1/3)/(1/8-1/6)
    0-9/2-1/3

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