Mathematics
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    arctan0.8/2
    90-arctan(0.8/2)-arctan(0.8)
    tan(-60)
    0.15*4+0.2*9+0.65*4
    ln(1/2)
    ㏒(36,6)
    (2/3)^4
    2/3^4
    [11*45+1+4]+[-11+4*51/4]-[11451*4+114*5*1*4+1+1+4+5*14]+[11451*4+114*5*1*4-1+14+5*14]
    arctan0.0001
    arccos[26×cos20.562/(26+2×1×cos14)]
    arccos[26×cos20.562
    768/48
    320÷16
    800÷25
    51÷3
    240÷60
    48÷12
    178-87.21+ 43221+531921 -12.79
    15 ×(- 5)÷(- 15 )× 5

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