Mathematics
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    0.12-(0.04+1.1*(0.09-0.04))
    0.12-(0.04+1.1*(0.12-0.04))
    0.12-0.04+1.1*(0.12-0.04)
    0.28×0.98
    2*(-9)-18*(1/6-1/2)
    2019^2+2020^2*1009^2-(2020*1009+1)
    2*1009^2-(2020*1009+1)
    1168-50
    1/2*15^2
    (2.181×1.79)/380.857
    (3/2)×3
    (69×2.5)/(cos13.0178)
    (25×2.5)/(cos13.0178)
    acos0.9743
    ((25+69)×2.5)/(2×120.59)
    ((25+69) ×2.5)/(2×cos13)
    (22×(tan30.627-tan20.42) +73×(tan24.123-tan20.42))/2π
    acos0.91267
    ((73×cos20.42)/(73+2×1×cos11.6498))
    acos0.8605

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