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)
    (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)
    (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)
    (19.2×7.0×17.39+13.3×5.89)/(19.2×(7.5+7)+15)
    (19.2×7.5×3.29+11.8×3.88)/(19.2×(7.5+7)+15)
    (18.6×9.0×3.29+11.8×3.88)/(18.6×(9+5.5)+40)
    4×7×420

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