Mathematics
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    -10lg(1-0.3974)=
    -10log(1.2)
    -10log(0.3974)
    -10log(1-0.3974)=
    -10log(2.235)=
    (-4/7)*(1/8)
    (-3/5)*(-2/3)
    17*23*491
    cos(π/2)
    cosπ/2
    arctan1
    tan(arccos0.85)—tan(arccos0.97)
    125*80
    250*(2/8*11/8)
    (8-6)/8
    8-6/8
    250*11/32
    250*2/8*11/8
    1-4
    (-1)^(0.5)

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