Mathematics
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    207000/(0.614×9573×215)
    207000/(0.614×9573)
    50sin72
    50cos72
    1÷15
    ln0.4=
    70÷2+70 =
    75÷2+75 =
     7863783781983819*37829483772772
    √12
    2arctan(4/10)
    2arctan(0.04/100)
    arctan(-7.33)
    arctan(-7.33)
    arctan(-7.33)
    [2046×(1+0.0518)×1.0796+0]×0.9910
    [1-1/(1+6.50%)^61.26]/[1-1/(1+6.50%)^70]
    2arctan0.0004
    2arctan0.004
    2arctan4/1000

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