Mathematics
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    (-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)
    (-1)^(-1)
    1+4
    ln1
    arcsin0.1
    arcsin14/140

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