（450*8-100）/8
    （8-100）/8
    sqrt(3/41)
    arctan((sqrt(3)+1)/(1-sqrt(3))
    sqrt(((5sqrt(2)-4)/41)^2+((5+4sqrt(2))/41)^2)
    arctan((sqrt(7)-sqrt(21))/(-sqrt(21)-sqrt(7)))
    ((-sqrt(21)-sqrt(7))/4)^2+((sqrt(7)-sqrt(21))/4)^2
    arctan((5+4sqrt(2))/(5sqrt(2)-4))
    sqrt(0.073171)
    ((5sqrt(2)-4)/41)^2+((5+4sqrt(2))/41)^2
    arctan((sqrt(3)+1)/(1-sqrt(3)))
    arctan((10sqrt(2))/23)
    sqrt729
    arctan((sqrt(3)+1)/(sqrt(3)-1))
    arctan(1/(2sqrt(3)))
    2-3/2
    2-2/3
    3-3/4
    lg0.0406
    7√472

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