Mathematics
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    arctan(tan40*cos340)
    √28
    -4+√28
    4²-4*-3*15
    (1.8-0.331)/2+0.331
    √1081
    (39+√1081)/2
    39^2-440
    √35
    √36
    -5.994938^2
    2√5/5×3√10/10-√5/5×√10/10
    2√5/5×3√10/10
    2018^2019
    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))))

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