Mathematics
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    arctan(0. 04×π)
    arctan(0.1333333333×π)
    arctan(0.6×π)
    0.14*3.14/180
    arctan(0.4×π)
    arctan0.001666666π
    arctan0.04π
    arctan0.133333333333π
    arctan0.1333333π
    arctan2π÷5
    800000*(1+0.007974)^-12 =
    arctan2π/120
    6000000*(1+0.008652)^-12=
    arctan2π/50
    arctan2π/15
    arctan(106/131)+arctan(106/81)
    arctan(92/117)+arctan(92/67)
    25(1+0.7cos(54.3)-0.3cos(108.6))
    arccos(0.6
    cos(54.3)

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