Mathematics
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     2.4%-2.5%+2.4%*(-2.5%)
     2.4%-2.5%+2.4%*(-2.5%)
    cos30+sin30/sqrt(3)
    tan30
    (1/1-1/3)+50
    (1-1/3)+50
    2/3+50
    90÷5/6
    【(88+2)÷(1-1/6)+4】÷(1-1/8)
    (-√3)^2
    94÷17/24
    94÷24/17
    1/2×1/15×1/3×1/2
    arctan(17.75/8.61)
    sqrt(2.8^2+4.45^2)
    arctan(2.8/4.45)
    arctan(4.45/2.8)
    arctan(4.45/2.8)
    acos(4.45/5.8)
    1+e2÷1-e2

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