-163987.11/145137.17
    116289.59/202546.47
    ((abs((exp(-50) - 1) / (exp(-50) + 1)) / 2) + 0.5)
    ((abs((exp(-30) - 1) / (exp(-30) + 1)) / 2) + 0.5)
    3^2
    3^
    21.63/16
    64.86/12
    1-0.7837
    1-78.37
    64.86+13.51
    !(134)
    C(14,4)
    1 2^(1/12) 2^(2/12) 2^(3/12) 2^(4/12) 2^(5/12) 2^(6/12) 2^(7/12) 2^(8/12) 2^(10/12) 2^(11/12) 2
    sin56
    sin79
    114+514*1919/810
    0.14/3900
    0.32/3900
    0.125×21.25×6.9^2-(70.213+80.883)/2

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