Mathematics
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    arctan(7.5/2.67)-arctan7.5-arctan(7.5/21)
    20(lg2.67-lg7.9)
    arctan4.47
    9900/9
    10000/3%
    5000/1
    10000+200
    10000-200
    1670*36*(126.85-18)
    e^(-0.6845)
    (-0.213*3.14)/0.977
    sqrt(1-0.0453)
    arctan10-arctan166.667-arctan0.6-arctan0.15
    arctan10-arctan166.667-90-arctan0.6-arctan0.15+180
    -㏒(10,0.000024)
    √0.00000000058
    √0.000000000058
    √5.8×10^-10
    -㏒(10,1.3×10^-3)
    5.8×10^-10

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