(880+4.2*4.2*1.2*24)/4.200/4.200
    (880+4.2*4.2*1.2*24)*1000/4200/4200
    (880+4.2*4.2*1.2*2.4)*1000/4200/4200
    arctan(3/4)-arctan(18/7)
    arctan(3/4)-arctan(18/7)
    arctan(-51/82)
    3.14/(4*sqrt(1-0.75^2))
    arctan(0.25*sqrt(5))
    arctan(sqrt(5))
    90+arctan(0.9*3.31)-arctan(0.02*3.31)-arctan(0.25*3.31)-arctan3.31
    90+arctan(0.9*3.31)-arctan(0.05*3.31)-arctan(0.25*3.31)-arctan3.31
    90+arctan(0.9*3.31)-arctan0.331-arctan(0.25*3.31)-arctan3.31
    180-90-arctan2-arctan0.5
    (2585×9.464+56.96×4.175)/(361.2×2.631+596×9.033)
    (19.2×9.0×17.39+13.3×5.89)/(19.2×(9+8.5)+15)
    √((6×174.12)/(19.2×（1.79×2.94-0.34）))
    √((6×169.93)/(19.2×（1.79×2.94-0.34）))
    (136.96×4.592+1446.7×8.26)/(319.8×8.088+396.9×3.159)
    (19.2×7.0×17.39+13.3×5.89)/(19.2×(7.5+7)+15)
    (19.2×7.0×17.39+13.3×5.89)/(19.2×(7.5+7)+15)

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