Examples:

    1.
      (x^2 - 1)/(x^3 + x + 2)

    2.

      5x^2 + 3x - 2 + 1/(x-1)

    3.

      [SQRT(2)x^5 - (9x^3)/4 + 3319x^2]/(2 - x^2)

    4.

      pi + 4x - 1/(x^2) + (3x-1)/(x+2)

    5.

      [x^3 + 8.5 x^2 - 5]/(x^5 - 1)

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