Mathematics
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    (0.8/60)^1/3
    sqrt(0.8/60)
    arctan(0.035*7.5)
    arctan(1*7.5)
    arctan(0.50*7.5)
    arctan(0.51*7.5)
    20lg80=
    1/[7.5*[14.32^0.5]]
    20*lg{15/[7.5*[(1+7.5^2)]^0.5]}
    20*lg{10/[7.5*[(1+7.5^2)]^0.5]}
    20*lg{10/[4.4*[(1+4.4^2)]^0.5]}
    20*lg{15/7.5*[(1+7.5^2)]^0.5}
    20*lg{10/4.4*[(1+4.4^2)]^0.5}
    20*lg{1/4.4*[(1+4.4^2)]^0.5}
    1/4.4*[(1+4.4^2)]^0.5
    arctan0.33333=
    arctan1/3=
    180(15+60)(0.65)
    200(40十15)(0.65)
    200(40)(0.65)

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