Mathematics
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    90-arctan(12.6/2)-arctan(12.6/5)-arctan(12.6/10)+arctan(12.6)
    2000^(1/3)
    20lg8-40lg2
    √(4^2+64)
    3.14/2
    tan0.5
    sqrt((270/4)^2+36)
    (-2)^4*(2.56-1.27)^2+(-1.69)
    270/4+36
    50*360/2/3.1415926/3.258
    50*360/2/3.1415926/4.107
    lg20
    20lg0.7
    8^24-8^23
    -108-(12)+23+18
    -2 4/3+(-3 3/2)+20 4/1-2 6/1
    (0.023/365)^365
    8^24-8^23
    2752-534
    (100000)/e-999

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