Mathematics
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    2018^2019 2019^2018
    arctan(-1)
    -1-2arctan(-1)
    ((0.05/(0.05*64.41))^2)/0.0714
    (0.0714^(1/6))/0.01
    -(1/(2*200*10^(-6)))+- sqrt((1/(2*200*10^(-6)))^2-(1/(0.64*10^(-6))))
    -(1/(2*200*10^(-6)))+sqrt((1/(2*200*10^(-6)))^2-(1/(0.64*10^(-6))))
    -(1/(2*200*1e-6))+sqrt((1/(2*200*1e-6))^2-(1/(0.64*1e-6)))
    90-arctan(10*sqrt(6)/3)-arctan(10*sqrt(6)/6)+arctan(10*sqrt(6)/9)
    40lg5-60lg(3/2)
    log(4,27)
    A(1,1) B(0,0)
    (1,1) (0,0)
    1-sin25
    30/31+0.4
    25/48×0.4×1.2
    360-33.56
    arctan(2.11/-3.18)
    (3.18^2+2.11^2)^0.5
    -5*0.3*sin240-40/3*0.2*sin300-10*0.3*sin30

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